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Diffstat (limited to 'include/inja/string_view.hpp')
| -rw-r--r-- | include/inja/string_view.hpp | 1416 |
1 files changed, 1416 insertions, 0 deletions
diff --git a/include/inja/string_view.hpp b/include/inja/string_view.hpp new file mode 100644 index 0000000..2bb50c9 --- /dev/null +++ b/include/inja/string_view.hpp @@ -0,0 +1,1416 @@ +// Copyright 2017-2019 by Martin Moene +// +// string-view lite, a C++17-like string_view for C++98 and later. +// For more information see https://github.com/martinmoene/string-view-lite +// +// Distributed under the Boost Software License, Version 1.0. +// (See accompanying file LICENSE.txt or copy at http://www.boost.org/LICENSE_1_0.txt) + +#pragma once + +#ifndef NONSTD_SV_LITE_H_INCLUDED +#define NONSTD_SV_LITE_H_INCLUDED + +#define string_view_lite_MAJOR 1 +#define string_view_lite_MINOR 4 +#define string_view_lite_PATCH 0 + +#define string_view_lite_VERSION \ + nssv_STRINGIFY(string_view_lite_MAJOR) "." nssv_STRINGIFY(string_view_lite_MINOR) "." nssv_STRINGIFY( \ + string_view_lite_PATCH) + +#define nssv_STRINGIFY(x) nssv_STRINGIFY_(x) +#define nssv_STRINGIFY_(x) #x + +// string-view lite configuration: + +#define nssv_STRING_VIEW_DEFAULT 0 +#define nssv_STRING_VIEW_NONSTD 1 +#define nssv_STRING_VIEW_STD 2 + +#if !defined(nssv_CONFIG_SELECT_STRING_VIEW) +#define nssv_CONFIG_SELECT_STRING_VIEW (nssv_HAVE_STD_STRING_VIEW ? nssv_STRING_VIEW_STD : nssv_STRING_VIEW_NONSTD) +#endif + +#if defined(nssv_CONFIG_SELECT_STD_STRING_VIEW) || defined(nssv_CONFIG_SELECT_NONSTD_STRING_VIEW) +#error nssv_CONFIG_SELECT_STD_STRING_VIEW and nssv_CONFIG_SELECT_NONSTD_STRING_VIEW are deprecated and removed, please use nssv_CONFIG_SELECT_STRING_VIEW=nssv_STRING_VIEW_... +#endif + +#ifndef nssv_CONFIG_STD_SV_OPERATOR +#define nssv_CONFIG_STD_SV_OPERATOR 0 +#endif + +#ifndef nssv_CONFIG_USR_SV_OPERATOR +#define nssv_CONFIG_USR_SV_OPERATOR 1 +#endif + +#ifdef nssv_CONFIG_CONVERSION_STD_STRING +#define nssv_CONFIG_CONVERSION_STD_STRING_CLASS_METHODS nssv_CONFIG_CONVERSION_STD_STRING +#define nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS nssv_CONFIG_CONVERSION_STD_STRING +#endif + +#ifndef nssv_CONFIG_CONVERSION_STD_STRING_CLASS_METHODS +#define nssv_CONFIG_CONVERSION_STD_STRING_CLASS_METHODS 1 +#endif + +#ifndef nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS +#define nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS 1 +#endif + +// Control presence of exception handling (try and auto discover): + +#ifndef nssv_CONFIG_NO_EXCEPTIONS +#if defined(__cpp_exceptions) || defined(__EXCEPTIONS) || defined(_CPPUNWIND) +#define nssv_CONFIG_NO_EXCEPTIONS 0 +#else +#define nssv_CONFIG_NO_EXCEPTIONS 1 +#endif +#endif + +// C++ language version detection (C++20 is speculative): +// Note: VC14.0/1900 (VS2015) lacks too much from C++14. + +#ifndef nssv_CPLUSPLUS +#if defined(_MSVC_LANG) && !defined(__clang__) +#define nssv_CPLUSPLUS (_MSC_VER == 1900 ? 201103L : _MSVC_LANG) +#else +#define nssv_CPLUSPLUS __cplusplus +#endif +#endif + +#define nssv_CPP98_OR_GREATER (nssv_CPLUSPLUS >= 199711L) +#define nssv_CPP11_OR_GREATER (nssv_CPLUSPLUS >= 201103L) +#define nssv_CPP11_OR_GREATER_ (nssv_CPLUSPLUS >= 201103L) +#define nssv_CPP14_OR_GREATER (nssv_CPLUSPLUS >= 201402L) +#define nssv_CPP17_OR_GREATER (nssv_CPLUSPLUS >= 201703L) +#define nssv_CPP20_OR_GREATER (nssv_CPLUSPLUS >= 202000L) + +// use C++17 std::string_view if available and requested: + +#if nssv_CPP17_OR_GREATER && defined(__has_include) +#if __has_include(<string_view> ) +#define nssv_HAVE_STD_STRING_VIEW 1 +#else +#define nssv_HAVE_STD_STRING_VIEW 0 +#endif +#else +#define nssv_HAVE_STD_STRING_VIEW 0 +#endif + +#define nssv_USES_STD_STRING_VIEW \ + ((nssv_CONFIG_SELECT_STRING_VIEW == nssv_STRING_VIEW_STD) || \ + ((nssv_CONFIG_SELECT_STRING_VIEW == nssv_STRING_VIEW_DEFAULT) && nssv_HAVE_STD_STRING_VIEW)) + +#define nssv_HAVE_STARTS_WITH (nssv_CPP20_OR_GREATER || !nssv_USES_STD_STRING_VIEW) +#define nssv_HAVE_ENDS_WITH nssv_HAVE_STARTS_WITH + +// +// Use C++17 std::string_view: +// + +#if nssv_USES_STD_STRING_VIEW + +#include <string_view> + +// Extensions for std::string: + +#if nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS + +namespace nonstd { + +template <class CharT, class Traits, class Allocator = std::allocator<CharT>> +std::basic_string<CharT, Traits, Allocator> to_string(std::basic_string_view<CharT, Traits> v, + Allocator const &a = Allocator()) { + return std::basic_string<CharT, Traits, Allocator>(v.begin(), v.end(), a); +} + +template <class CharT, class Traits, class Allocator> +std::basic_string_view<CharT, Traits> to_string_view(std::basic_string<CharT, Traits, Allocator> const &s) { + return std::basic_string_view<CharT, Traits>(s.data(), s.size()); +} + +// Literal operators sv and _sv: + +#if nssv_CONFIG_STD_SV_OPERATOR + +using namespace std::literals::string_view_literals; + +#endif + +#if nssv_CONFIG_USR_SV_OPERATOR + +inline namespace literals { +inline namespace string_view_literals { + +constexpr std::string_view operator"" _sv(const char *str, size_t len) noexcept // (1) +{ + return std::string_view {str, len}; +} + +constexpr std::u16string_view operator"" _sv(const char16_t *str, size_t len) noexcept // (2) +{ + return std::u16string_view {str, len}; +} + +constexpr std::u32string_view operator"" _sv(const char32_t *str, size_t len) noexcept // (3) +{ + return std::u32string_view {str, len}; +} + +constexpr std::wstring_view operator"" _sv(const wchar_t *str, size_t len) noexcept // (4) +{ + return std::wstring_view {str, len}; +} + +} // namespace string_view_literals +} // namespace literals + +#endif // nssv_CONFIG_USR_SV_OPERATOR + +} // namespace nonstd + +#endif // nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS + +namespace nonstd { + +using std::basic_string_view; +using std::string_view; +using std::u16string_view; +using std::u32string_view; +using std::wstring_view; + +// literal "sv" and "_sv", see above + +using std::operator==; +using std::operator!=; +using std::operator<; +using std::operator<=; +using std::operator>; +using std::operator>=; + +using std::operator<<; + +} // namespace nonstd + +#else // nssv_HAVE_STD_STRING_VIEW + +// +// Before C++17: use string_view lite: +// + +// Compiler versions: +// +// MSVC++ 6.0 _MSC_VER == 1200 (Visual Studio 6.0) +// MSVC++ 7.0 _MSC_VER == 1300 (Visual Studio .NET 2002) +// MSVC++ 7.1 _MSC_VER == 1310 (Visual Studio .NET 2003) +// MSVC++ 8.0 _MSC_VER == 1400 (Visual Studio 2005) +// MSVC++ 9.0 _MSC_VER == 1500 (Visual Studio 2008) +// MSVC++ 10.0 _MSC_VER == 1600 (Visual Studio 2010) +// MSVC++ 11.0 _MSC_VER == 1700 (Visual Studio 2012) +// MSVC++ 12.0 _MSC_VER == 1800 (Visual Studio 2013) +// MSVC++ 14.0 _MSC_VER == 1900 (Visual Studio 2015) +// MSVC++ 14.1 _MSC_VER >= 1910 (Visual Studio 2017) + +#if defined(_MSC_VER) && !defined(__clang__) +#define nssv_COMPILER_MSVC_VER (_MSC_VER) +#define nssv_COMPILER_MSVC_VERSION (_MSC_VER / 10 - 10 * (5 + (_MSC_VER < 1900))) +#else +#define nssv_COMPILER_MSVC_VER 0 +#define nssv_COMPILER_MSVC_VERSION 0 +#endif + +#define nssv_COMPILER_VERSION(major, minor, patch) (10 * (10 * (major) + (minor)) + (patch)) + +#if defined(__clang__) +#define nssv_COMPILER_CLANG_VERSION nssv_COMPILER_VERSION(__clang_major__, __clang_minor__, __clang_patchlevel__) +#else +#define nssv_COMPILER_CLANG_VERSION 0 +#endif + +#if defined(__GNUC__) && !defined(__clang__) +#define nssv_COMPILER_GNUC_VERSION nssv_COMPILER_VERSION(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__) +#else +#define nssv_COMPILER_GNUC_VERSION 0 +#endif + +// half-open range [lo..hi): +#define nssv_BETWEEN(v, lo, hi) ((lo) <= (v) && (v) < (hi)) + +// Presence of language and library features: + +#ifdef _HAS_CPP0X +#define nssv_HAS_CPP0X _HAS_CPP0X +#else +#define nssv_HAS_CPP0X 0 +#endif + +// Unless defined otherwise below, consider VC14 as C++11 for variant-lite: + +#if nssv_COMPILER_MSVC_VER >= 1900 +#undef nssv_CPP11_OR_GREATER +#define nssv_CPP11_OR_GREATER 1 +#endif + +#define nssv_CPP11_90 (nssv_CPP11_OR_GREATER_ || nssv_COMPILER_MSVC_VER >= 1500) +#define nssv_CPP11_100 (nssv_CPP11_OR_GREATER_ || nssv_COMPILER_MSVC_VER >= 1600) +#define nssv_CPP11_110 (nssv_CPP11_OR_GREATER_ || nssv_COMPILER_MSVC_VER >= 1700) +#define nssv_CPP11_120 (nssv_CPP11_OR_GREATER_ || nssv_COMPILER_MSVC_VER >= 1800) +#define nssv_CPP11_140 (nssv_CPP11_OR_GREATER_ || nssv_COMPILER_MSVC_VER >= 1900) +#define nssv_CPP11_141 (nssv_CPP11_OR_GREATER_ || nssv_COMPILER_MSVC_VER >= 1910) + +#define nssv_CPP14_000 (nssv_CPP14_OR_GREATER) +#define nssv_CPP17_000 (nssv_CPP17_OR_GREATER) + +// Presence of C++11 language features: + +#define nssv_HAVE_CONSTEXPR_11 nssv_CPP11_140 +#define nssv_HAVE_EXPLICIT_CONVERSION nssv_CPP11_140 +#define nssv_HAVE_INLINE_NAMESPACE nssv_CPP11_140 +#define nssv_HAVE_NOEXCEPT nssv_CPP11_140 +#define nssv_HAVE_NULLPTR nssv_CPP11_100 +#define nssv_HAVE_REF_QUALIFIER nssv_CPP11_140 +#define nssv_HAVE_UNICODE_LITERALS nssv_CPP11_140 +#define nssv_HAVE_USER_DEFINED_LITERALS nssv_CPP11_140 +#define nssv_HAVE_WCHAR16_T nssv_CPP11_100 +#define nssv_HAVE_WCHAR32_T nssv_CPP11_100 + +#if !((nssv_CPP11_OR_GREATER && nssv_COMPILER_CLANG_VERSION) || nssv_BETWEEN(nssv_COMPILER_CLANG_VERSION, 300, 400)) +#define nssv_HAVE_STD_DEFINED_LITERALS nssv_CPP11_140 +#else +#define nssv_HAVE_STD_DEFINED_LITERALS 0 +#endif + +// Presence of C++14 language features: + +#define nssv_HAVE_CONSTEXPR_14 nssv_CPP14_000 + +// Presence of C++17 language features: + +#define nssv_HAVE_NODISCARD nssv_CPP17_000 + +// Presence of C++ library features: + +#define nssv_HAVE_STD_HASH nssv_CPP11_120 + +// C++ feature usage: + +#if nssv_HAVE_CONSTEXPR_11 +#define nssv_constexpr constexpr +#else +#define nssv_constexpr /*constexpr*/ +#endif + +#if nssv_HAVE_CONSTEXPR_14 +#define nssv_constexpr14 constexpr +#else +#define nssv_constexpr14 /*constexpr*/ +#endif + +#if nssv_HAVE_EXPLICIT_CONVERSION +#define nssv_explicit explicit +#else +#define nssv_explicit /*explicit*/ +#endif + +#if nssv_HAVE_INLINE_NAMESPACE +#define nssv_inline_ns inline +#else +#define nssv_inline_ns /*inline*/ +#endif + +#if nssv_HAVE_NOEXCEPT +#define nssv_noexcept noexcept +#else +#define nssv_noexcept /*noexcept*/ +#endif + +//#if nssv_HAVE_REF_QUALIFIER +//# define nssv_ref_qual & +//# define nssv_refref_qual && +//#else +//# define nssv_ref_qual /*&*/ +//# define nssv_refref_qual /*&&*/ +//#endif + +#if nssv_HAVE_NULLPTR +#define nssv_nullptr nullptr +#else +#define nssv_nullptr NULL +#endif + +#if nssv_HAVE_NODISCARD +#define nssv_nodiscard [[nodiscard]] +#else +#define nssv_nodiscard /*[[nodiscard]]*/ +#endif + +// Additional includes: + +#include <algorithm> +#include <cassert> +#include <iterator> +#include <limits> +#include <ostream> +#include <string> // std::char_traits<> + +#if !nssv_CONFIG_NO_EXCEPTIONS +#include <stdexcept> +#endif + +#if nssv_CPP11_OR_GREATER +#include <type_traits> +#endif + +// Clang, GNUC, MSVC warning suppression macros: + +#if defined(__clang__) +#pragma clang diagnostic ignored "-Wreserved-user-defined-literal" +#pragma clang diagnostic push +#pragma clang diagnostic ignored "-Wuser-defined-literals" +#elif defined(__GNUC__) +#pragma GCC diagnostic push +#pragma GCC diagnostic ignored "-Wliteral-suffix" +#endif // __clang__ + +#if nssv_COMPILER_MSVC_VERSION >= 140 +#define nssv_SUPPRESS_MSGSL_WARNING(expr) [[gsl::suppress(expr)]] +#define nssv_SUPPRESS_MSVC_WARNING(code, descr) __pragma(warning(suppress : code)) +#define nssv_DISABLE_MSVC_WARNINGS(codes) __pragma(warning(push)) __pragma(warning(disable : codes)) +#else +#define nssv_SUPPRESS_MSGSL_WARNING(expr) +#define nssv_SUPPRESS_MSVC_WARNING(code, descr) +#define nssv_DISABLE_MSVC_WARNINGS(codes) +#endif + +#if defined(__clang__) +#define nssv_RESTORE_WARNINGS() _Pragma("clang diagnostic pop") +#elif defined(__GNUC__) +#define nssv_RESTORE_WARNINGS() _Pragma("GCC diagnostic pop") +#elif nssv_COMPILER_MSVC_VERSION >= 140 +#define nssv_RESTORE_WARNINGS() __pragma(warning(pop)) +#else +#define nssv_RESTORE_WARNINGS() +#endif + +// Suppress the following MSVC (GSL) warnings: +// - C4455, non-gsl : 'operator ""sv': literal suffix identifiers that do not +// start with an underscore are reserved +// - C26472, gsl::t.1 : don't use a static_cast for arithmetic conversions; +// use brace initialization, gsl::narrow_cast or gsl::narow +// - C26481: gsl::b.1 : don't use pointer arithmetic. Use span instead + +nssv_DISABLE_MSVC_WARNINGS(4455 26481 26472) + // nssv_DISABLE_CLANG_WARNINGS( "-Wuser-defined-literals" ) + // nssv_DISABLE_GNUC_WARNINGS( -Wliteral-suffix ) + + namespace nonstd { + namespace sv_lite { + +#if nssv_CPP11_OR_GREATER + + namespace detail { + + // Expect tail call optimization to make length() non-recursive: + + template <typename CharT> inline constexpr std::size_t length(CharT *s, std::size_t result = 0) { + return *s == '\0' ? result : length(s + 1, result + 1); + } + + } // namespace detail + +#endif // nssv_CPP11_OR_GREATER + + template <class CharT, class Traits = std::char_traits<CharT>> class basic_string_view; + + // + // basic_string_view: + // + + template <class CharT, class Traits /* = std::char_traits<CharT> */ + > + class basic_string_view { + public: + // Member types: + + typedef Traits traits_type; + typedef CharT value_type; + + typedef CharT *pointer; + typedef CharT const *const_pointer; + typedef CharT &reference; + typedef CharT const &const_reference; + + typedef const_pointer iterator; + typedef const_pointer const_iterator; + typedef std::reverse_iterator<const_iterator> reverse_iterator; + typedef std::reverse_iterator<const_iterator> const_reverse_iterator; + + typedef std::size_t size_type; + typedef std::ptrdiff_t difference_type; + + // 24.4.2.1 Construction and assignment: + + nssv_constexpr basic_string_view() nssv_noexcept : data_(nssv_nullptr), size_(0) {} + +#if nssv_CPP11_OR_GREATER + nssv_constexpr basic_string_view(basic_string_view const &other) nssv_noexcept = default; +#else + nssv_constexpr basic_string_view(basic_string_view const &other) nssv_noexcept : data_(other.data_), + size_(other.size_) {} +#endif + + nssv_constexpr basic_string_view(CharT const *s, size_type count) nssv_noexcept // non-standard noexcept + : data_(s), + size_(count) {} + + nssv_constexpr basic_string_view(CharT const *s) nssv_noexcept // non-standard noexcept + : data_(s) +#if nssv_CPP17_OR_GREATER + , + size_(Traits::length(s)) +#elif nssv_CPP11_OR_GREATER + , + size_(detail::length(s)) +#else + , + size_(Traits::length(s)) +#endif + { + } + + // Assignment: + +#if nssv_CPP11_OR_GREATER + nssv_constexpr14 basic_string_view &operator=(basic_string_view const &other) nssv_noexcept = default; +#else + nssv_constexpr14 basic_string_view &operator=(basic_string_view const &other) nssv_noexcept { + data_ = other.data_; + size_ = other.size_; + return *this; + } +#endif + + // 24.4.2.2 Iterator support: + + nssv_constexpr const_iterator begin() const nssv_noexcept { return data_; } + nssv_constexpr const_iterator end() const nssv_noexcept { return data_ + size_; } + + nssv_constexpr const_iterator cbegin() const nssv_noexcept { return begin(); } + nssv_constexpr const_iterator cend() const nssv_noexcept { return end(); } + + nssv_constexpr const_reverse_iterator rbegin() const nssv_noexcept { return const_reverse_iterator(end()); } + nssv_constexpr const_reverse_iterator rend() const nssv_noexcept { return const_reverse_iterator(begin()); } + + nssv_constexpr const_reverse_iterator crbegin() const nssv_noexcept { return rbegin(); } + nssv_constexpr const_reverse_iterator crend() const nssv_noexcept { return rend(); } + + // 24.4.2.3 Capacity: + + nssv_constexpr size_type size() const nssv_noexcept { return size_; } + nssv_constexpr size_type length() const nssv_noexcept { return size_; } + nssv_constexpr size_type max_size() const nssv_noexcept { return (std::numeric_limits<size_type>::max)(); } + + // since C++20 + nssv_nodiscard nssv_constexpr bool empty() const nssv_noexcept { return 0 == size_; } + + // 24.4.2.4 Element access: + + nssv_constexpr const_reference operator[](size_type pos) const { return data_at(pos); } + + nssv_constexpr14 const_reference at(size_type pos) const { +#if nssv_CONFIG_NO_EXCEPTIONS + assert(pos < size()); +#else + if (pos >= size()) { + throw std::out_of_range("nonstd::string_view::at()"); + } +#endif + return data_at(pos); + } + + nssv_constexpr const_reference front() const { return data_at(0); } + nssv_constexpr const_reference back() const { return data_at(size() - 1); } + + nssv_constexpr const_pointer data() const nssv_noexcept { return data_; } + + // 24.4.2.5 Modifiers: + + nssv_constexpr14 void remove_prefix(size_type n) { + assert(n <= size()); + data_ += n; + size_ -= n; + } + + nssv_constexpr14 void remove_suffix(size_type n) { + assert(n <= size()); + size_ -= n; + } + + nssv_constexpr14 void swap(basic_string_view &other) nssv_noexcept { + using std::swap; + swap(data_, other.data_); + swap(size_, other.size_); + } + + // 24.4.2.6 String operations: + + size_type copy(CharT *dest, size_type n, size_type pos = 0) const { +#if nssv_CONFIG_NO_EXCEPTIONS + assert(pos <= size()); +#else + if (pos > size()) { + throw std::out_of_range("nonstd::string_view::copy()"); + } +#endif + const size_type rlen = (std::min)(n, size() - pos); + + (void)Traits::copy(dest, data() + pos, rlen); + + return rlen; + } + + nssv_constexpr14 basic_string_view substr(size_type pos = 0, size_type n = npos) const { +#if nssv_CONFIG_NO_EXCEPTIONS + assert(pos <= size()); +#else + if (pos > size()) { + throw std::out_of_range("nonstd::string_view::substr()"); + } +#endif + return basic_string_view(data() + pos, (std::min)(n, size() - pos)); + } + + // compare(), 6x: + + nssv_constexpr14 int compare(basic_string_view other) const nssv_noexcept // (1) + { + if (const int result = Traits::compare(data(), other.data(), (std::min)(size(), other.size()))) { + return result; + } + + return size() == other.size() ? 0 : size() < other.size() ? -1 : 1; + } + + nssv_constexpr int compare(size_type pos1, size_type n1, basic_string_view other) const // (2) + { + return substr(pos1, n1).compare(other); + } + + nssv_constexpr int compare(size_type pos1, size_type n1, basic_string_view other, size_type pos2, + size_type n2) const // (3) + { + return substr(pos1, n1).compare(other.substr(pos2, n2)); + } + + nssv_constexpr int compare(CharT const *s) const // (4) + { + return compare(basic_string_view(s)); + } + + nssv_constexpr int compare(size_type pos1, size_type n1, CharT const *s) const // (5) + { + return substr(pos1, n1).compare(basic_string_view(s)); + } + + nssv_constexpr int compare(size_type pos1, size_type n1, CharT const *s, size_type n2) const // (6) + { + return substr(pos1, n1).compare(basic_string_view(s, n2)); + } + + // 24.4.2.7 Searching: + + // starts_with(), 3x, since C++20: + + nssv_constexpr bool starts_with(basic_string_view v) const nssv_noexcept // (1) + { + return size() >= v.size() && compare(0, v.size(), v) == 0; + } + + nssv_constexpr bool starts_with(CharT c) const nssv_noexcept // (2) + { + return starts_with(basic_string_view(&c, 1)); + } + + nssv_constexpr bool starts_with(CharT const *s) const // (3) + { + return starts_with(basic_string_view(s)); + } + + // ends_with(), 3x, since C++20: + + nssv_constexpr bool ends_with(basic_string_view v) const nssv_noexcept // (1) + { + return size() >= v.size() && compare(size() - v.size(), npos, v) == 0; + } + + nssv_constexpr bool ends_with(CharT c) const nssv_noexcept // (2) + { + return ends_with(basic_string_view(&c, 1)); + } + + nssv_constexpr bool ends_with(CharT const *s) const // (3) + { + return ends_with(basic_string_view(s)); + } + + // find(), 4x: + + nssv_constexpr14 size_type find(basic_string_view v, size_type pos = 0) const nssv_noexcept // (1) + { + return assert(v.size() == 0 || v.data() != nssv_nullptr), + pos >= size() ? npos : to_pos(std::search(cbegin() + pos, cend(), v.cbegin(), v.cend(), Traits::eq)); + } + + nssv_constexpr14 size_type find(CharT c, size_type pos = 0) const nssv_noexcept // (2) + { + return find(basic_string_view(&c, 1), pos); + } + + nssv_constexpr14 size_type find(CharT const *s, size_type pos, size_type n) const // (3) + { + return find(basic_string_view(s, n), pos); + } + + nssv_constexpr14 size_type find(CharT const *s, size_type pos = 0) const // (4) + { + return find(basic_string_view(s), pos); + } + + // rfind(), 4x: + + nssv_constexpr14 size_type rfind(basic_string_view v, size_type pos = npos) const nssv_noexcept // (1) + { + if (size() < v.size()) { + return npos; + } + + if (v.empty()) { + return (std::min)(size(), pos); + } + + const_iterator last = cbegin() + (std::min)(size() - v.size(), pos) + v.size(); + const_iterator result = std::find_end(cbegin(), last, v.cbegin(), v.cend(), Traits::eq); + + return result != last ? size_type(result - cbegin()) : npos; + } + + nssv_constexpr14 size_type rfind(CharT c, size_type pos = npos) const nssv_noexcept // (2) + { + return rfind(basic_string_view(&c, 1), pos); + } + + nssv_constexpr14 size_type rfind(CharT const *s, size_type pos, size_type n) const // (3) + { + return rfind(basic_string_view(s, n), pos); + } + + nssv_constexpr14 size_type rfind(CharT const *s, size_type pos = npos) const // (4) + { + return rfind(basic_string_view(s), pos); + } + + // find_first_of(), 4x: + + nssv_constexpr size_type find_first_of(basic_string_view v, size_type pos = 0) const nssv_noexcept // (1) + { + return pos >= size() ? npos + : to_pos(std::find_first_of(cbegin() + pos, cend(), v.cbegin(), v.cend(), Traits::eq)); + } + + nssv_constexpr size_type find_first_of(CharT c, size_type pos = 0) const nssv_noexcept // (2) + { + return find_first_of(basic_string_view(&c, 1), pos); + } + + nssv_constexpr size_type find_first_of(CharT const *s, size_type pos, size_type n) const // (3) + { + return find_first_of(basic_string_view(s, n), pos); + } + + nssv_constexpr size_type find_first_of(CharT const *s, size_type pos = 0) const // (4) + { + return find_first_of(basic_string_view(s), pos); + } + + // find_last_of(), 4x: + + nssv_constexpr size_type find_last_of(basic_string_view v, size_type pos = npos) const nssv_noexcept // (1) + { + return empty() ? npos + : pos >= size() ? find_last_of(v, size() - 1) + : to_pos(std::find_first_of(const_reverse_iterator(cbegin() + pos + 1), crend(), + v.cbegin(), v.cend(), Traits::eq)); + } + + nssv_constexpr size_type find_last_of(CharT c, size_type pos = npos) const nssv_noexcept // (2) + { + return find_last_of(basic_string_view(&c, 1), pos); + } + + nssv_constexpr size_type find_last_of(CharT const *s, size_type pos, size_type count) const // (3) + { + return find_last_of(basic_string_view(s, count), pos); + } + + nssv_constexpr size_type find_last_of(CharT const *s, size_type pos = npos) const // (4) + { + return find_last_of(basic_string_view(s), pos); + } + + // find_first_not_of(), 4x: + + nssv_constexpr size_type find_first_not_of(basic_string_view v, size_type pos = 0) const nssv_noexcept // (1) + { + return pos >= size() ? npos : to_pos(std::find_if(cbegin() + pos, cend(), not_in_view(v))); + } + + nssv_constexpr size_type find_first_not_of(CharT c, size_type pos = 0) const nssv_noexcept // (2) + { + return find_first_not_of(basic_string_view(&c, 1), pos); + } + + nssv_constexpr size_type find_first_not_of(CharT const *s, size_type pos, size_type count) const // (3) + { + return find_first_not_of(basic_string_view(s, count), pos); + } + + nssv_constexpr size_type find_first_not_of(CharT const *s, size_type pos = 0) const // (4) + { + return find_first_not_of(basic_string_view(s), pos); + } + + // find_last_not_of(), 4x: + + nssv_constexpr size_type find_last_not_of(basic_string_view v, size_type pos = npos) const nssv_noexcept // (1) + { + return empty() ? npos + : pos >= size() + ? find_last_not_of(v, size() - 1) + : to_pos(std::find_if(const_reverse_iterator(cbegin() + pos + 1), crend(), not_in_view(v))); + } + + nssv_constexpr size_type find_last_not_of(CharT c, size_type pos = npos) const nssv_noexcept // (2) + { + return find_last_not_of(basic_string_view(&c, 1), pos); + } + + nssv_constexpr size_type find_last_not_of(CharT const *s, size_type pos, size_type count) const // (3) + { + return find_last_not_of(basic_string_view(s, count), pos); + } + + nssv_constexpr size_type find_last_not_of(CharT const *s, size_type pos = npos) const // (4) + { + return find_last_not_of(basic_string_view(s), pos); + } + + // Constants: + +#if nssv_CPP17_OR_GREATER + static nssv_constexpr size_type npos = size_type(-1); +#elif nssv_CPP11_OR_GREATER + enum : size_type { npos = size_type(-1) }; +#else + enum { npos = size_type(-1) }; +#endif + + private: + struct not_in_view { + const basic_string_view v; + + nssv_constexpr explicit not_in_view(basic_string_view v) : v(v) {} + + nssv_constexpr bool operator()(CharT c) const { return npos == v.find_first_of(c); } + }; + + nssv_constexpr size_type to_pos(const_iterator it) const { return it == cend() ? npos : size_type(it - cbegin()); } + + nssv_constexpr size_type to_pos(const_reverse_iterator it) const { + return it == crend() ? npos : size_type(crend() - it - 1); + } + + nssv_constexpr const_reference data_at(size_type pos) const { +#if nssv_BETWEEN(nssv_COMPILER_GNUC_VERSION, 1, 500) + return data_[pos]; +#else + return assert(pos < size()), data_[pos]; +#endif + } + + private: + const_pointer data_; + size_type size_; + + public: +#if nssv_CONFIG_CONVERSION_STD_STRING_CLASS_METHODS + + template <class Allocator> + basic_string_view(std::basic_string<CharT, Traits, Allocator> const &s) nssv_noexcept : data_(s.data()), + size_(s.size()) {} + +#if nssv_HAVE_EXPLICIT_CONVERSION + + template <class Allocator> explicit operator std::basic_string<CharT, Traits, Allocator>() const { + return to_string(Allocator()); + } + +#endif // nssv_HAVE_EXPLICIT_CONVERSION + +#if nssv_CPP11_OR_GREATER + + template <class Allocator = std::allocator<CharT>> + std::basic_string<CharT, Traits, Allocator> to_string(Allocator const &a = Allocator()) const { + return std::basic_string<CharT, Traits, Allocator>(begin(), end(), a); + } + +#else + + std::basic_string<CharT, Traits> to_string() const { return std::basic_string<CharT, Traits>(begin(), end()); } + + template <class Allocator> std::basic_string<CharT, Traits, Allocator> to_string(Allocator const &a) const { + return std::basic_string<CharT, Traits, Allocator>(begin(), end(), a); + } + +#endif // nssv_CPP11_OR_GREATER + +#endif // nssv_CONFIG_CONVERSION_STD_STRING_CLASS_METHODS + }; + + // + // Non-member functions: + // + + // 24.4.3 Non-member comparison functions: + // lexicographically compare two string views (function template): + + template <class CharT, class Traits> + nssv_constexpr bool operator==(basic_string_view<CharT, Traits> lhs, + basic_string_view<CharT, Traits> rhs) nssv_noexcept { + return lhs.compare(rhs) == 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator!=(basic_string_view<CharT, Traits> lhs, + basic_string_view<CharT, Traits> rhs) nssv_noexcept { + return lhs.compare(rhs) != 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator<(basic_string_view<CharT, Traits> lhs, + basic_string_view<CharT, Traits> rhs) nssv_noexcept { + return lhs.compare(rhs) < 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator<=(basic_string_view<CharT, Traits> lhs, + basic_string_view<CharT, Traits> rhs) nssv_noexcept { + return lhs.compare(rhs) <= 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator>(basic_string_view<CharT, Traits> lhs, + basic_string_view<CharT, Traits> rhs) nssv_noexcept { + return lhs.compare(rhs) > 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator>=(basic_string_view<CharT, Traits> lhs, + basic_string_view<CharT, Traits> rhs) nssv_noexcept { + return lhs.compare(rhs) >= 0; + } + + // Let S be basic_string_view<CharT, Traits>, and sv be an instance of S. + // Implementations shall provide sufficient additional overloads marked + // constexpr and noexcept so that an object t with an implicit conversion + // to S can be compared according to Table 67. + +#if !nssv_CPP11_OR_GREATER || nssv_BETWEEN(nssv_COMPILER_MSVC_VERSION, 100, 141) + + // accomodate for older compilers: + + // == + + template <class CharT, class Traits> + nssv_constexpr bool operator==(basic_string_view<CharT, Traits> lhs, char const *rhs) nssv_noexcept { + return lhs.compare(rhs) == 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator==(char const *lhs, basic_string_view<CharT, Traits> rhs) nssv_noexcept { + return rhs.compare(lhs) == 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator==(basic_string_view<CharT, Traits> lhs, + std::basic_string<CharT, Traits> rhs) nssv_noexcept { + return lhs.size() == rhs.size() && lhs.compare(rhs) == 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator==(std::basic_string<CharT, Traits> rhs, + basic_string_view<CharT, Traits> lhs) nssv_noexcept { + return lhs.size() == rhs.size() && lhs.compare(rhs) == 0; + } + + // != + + template <class CharT, class Traits> + nssv_constexpr bool operator!=(basic_string_view<CharT, Traits> lhs, char const *rhs) nssv_noexcept { + return lhs.compare(rhs) != 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator!=(char const *lhs, basic_string_view<CharT, Traits> rhs) nssv_noexcept { + return rhs.compare(lhs) != 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator!=(basic_string_view<CharT, Traits> lhs, + std::basic_string<CharT, Traits> rhs) nssv_noexcept { + return lhs.size() != rhs.size() && lhs.compare(rhs) != 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator!=(std::basic_string<CharT, Traits> rhs, + basic_string_view<CharT, Traits> lhs) nssv_noexcept { + return lhs.size() != rhs.size() || rhs.compare(lhs) != 0; + } + + // < + + template <class CharT, class Traits> + nssv_constexpr bool operator<(basic_string_view<CharT, Traits> lhs, char const *rhs) nssv_noexcept { + return lhs.compare(rhs) < 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator<(char const *lhs, basic_string_view<CharT, Traits> rhs) nssv_noexcept { + return rhs.compare(lhs) > 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator<(basic_string_view<CharT, Traits> lhs, + std::basic_string<CharT, Traits> rhs) nssv_noexcept { + return lhs.compare(rhs) < 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator<(std::basic_string<CharT, Traits> rhs, + basic_string_view<CharT, Traits> lhs) nssv_noexcept { + return rhs.compare(lhs) > 0; + } + + // <= + + template <class CharT, class Traits> + nssv_constexpr bool operator<=(basic_string_view<CharT, Traits> lhs, char const *rhs) nssv_noexcept { + return lhs.compare(rhs) <= 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator<=(char const *lhs, basic_string_view<CharT, Traits> rhs) nssv_noexcept { + return rhs.compare(lhs) >= 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator<=(basic_string_view<CharT, Traits> lhs, + std::basic_string<CharT, Traits> rhs) nssv_noexcept { + return lhs.compare(rhs) <= 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator<=(std::basic_string<CharT, Traits> rhs, + basic_string_view<CharT, Traits> lhs) nssv_noexcept { + return rhs.compare(lhs) >= 0; + } + + // > + + template <class CharT, class Traits> + nssv_constexpr bool operator>(basic_string_view<CharT, Traits> lhs, char const *rhs) nssv_noexcept { + return lhs.compare(rhs) > 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator>(char const *lhs, basic_string_view<CharT, Traits> rhs) nssv_noexcept { + return rhs.compare(lhs) < 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator>(basic_string_view<CharT, Traits> lhs, + std::basic_string<CharT, Traits> rhs) nssv_noexcept { + return lhs.compare(rhs) > 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator>(std::basic_string<CharT, Traits> rhs, + basic_string_view<CharT, Traits> lhs) nssv_noexcept { + return rhs.compare(lhs) < 0; + } + + // >= + + template <class CharT, class Traits> + nssv_constexpr bool operator>=(basic_string_view<CharT, Traits> lhs, char const *rhs) nssv_noexcept { + return lhs.compare(rhs) >= 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator>=(char const *lhs, basic_string_view<CharT, Traits> rhs) nssv_noexcept { + return rhs.compare(lhs) <= 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator>=(basic_string_view<CharT, Traits> lhs, + std::basic_string<CharT, Traits> rhs) nssv_noexcept { + return lhs.compare(rhs) >= 0; + } + + template <class CharT, class Traits> + nssv_constexpr bool operator>=(std::basic_string<CharT, Traits> rhs, + basic_string_view<CharT, Traits> lhs) nssv_noexcept { + return rhs.compare(lhs) <= 0; + } + +#else // newer compilers: + +#define nssv_BASIC_STRING_VIEW_I(T, U) typename std::decay<basic_string_view<T, U>>::type + +#if nssv_BETWEEN(nssv_COMPILER_MSVC_VERSION, 140, 150) +#define nssv_MSVC_ORDER(x) , int = x +#else +#define nssv_MSVC_ORDER(x) /*, int=x*/ +#endif + + // == + + template <class CharT, class Traits nssv_MSVC_ORDER(1)> + nssv_constexpr bool operator==(basic_string_view<CharT, Traits> lhs, + nssv_BASIC_STRING_VIEW_I(CharT, Traits) rhs) nssv_noexcept { + return lhs.compare(rhs) == 0; + } + + template <class CharT, class Traits nssv_MSVC_ORDER(2)> + nssv_constexpr bool operator==(nssv_BASIC_STRING_VIEW_I(CharT, Traits) lhs, + basic_string_view<CharT, Traits> rhs) nssv_noexcept { + return lhs.size() == rhs.size() && lhs.compare(rhs) == 0; + } + + // != + + template <class CharT, class Traits nssv_MSVC_ORDER(1)> + nssv_constexpr bool operator!=(basic_string_view<CharT, Traits> lhs, + nssv_BASIC_STRING_VIEW_I(CharT, Traits) rhs) nssv_noexcept { + return lhs.size() != rhs.size() || lhs.compare(rhs) != 0; + } + + template <class CharT, class Traits nssv_MSVC_ORDER(2)> + nssv_constexpr bool operator!=(nssv_BASIC_STRING_VIEW_I(CharT, Traits) lhs, + basic_string_view<CharT, Traits> rhs) nssv_noexcept { + return lhs.compare(rhs) != 0; + } + + // < + + template <class CharT, class Traits nssv_MSVC_ORDER(1)> + nssv_constexpr bool operator<(basic_string_view<CharT, Traits> lhs, + nssv_BASIC_STRING_VIEW_I(CharT, Traits) rhs) nssv_noexcept { + return lhs.compare(rhs) < 0; + } + + template <class CharT, class Traits nssv_MSVC_ORDER(2)> + nssv_constexpr bool operator<(nssv_BASIC_STRING_VIEW_I(CharT, Traits) lhs, + basic_string_view<CharT, Traits> rhs) nssv_noexcept { + return lhs.compare(rhs) < 0; + } + + // <= + + template <class CharT, class Traits nssv_MSVC_ORDER(1)> + nssv_constexpr bool operator<=(basic_string_view<CharT, Traits> lhs, + nssv_BASIC_STRING_VIEW_I(CharT, Traits) rhs) nssv_noexcept { + return lhs.compare(rhs) <= 0; + } + + template <class CharT, class Traits nssv_MSVC_ORDER(2)> + nssv_constexpr bool operator<=(nssv_BASIC_STRING_VIEW_I(CharT, Traits) lhs, + basic_string_view<CharT, Traits> rhs) nssv_noexcept { + return lhs.compare(rhs) <= 0; + } + + // > + + template <class CharT, class Traits nssv_MSVC_ORDER(1)> + nssv_constexpr bool operator>(basic_string_view<CharT, Traits> lhs, + nssv_BASIC_STRING_VIEW_I(CharT, Traits) rhs) nssv_noexcept { + return lhs.compare(rhs) > 0; + } + + template <class CharT, class Traits nssv_MSVC_ORDER(2)> + nssv_constexpr bool operator>(nssv_BASIC_STRING_VIEW_I(CharT, Traits) lhs, + basic_string_view<CharT, Traits> rhs) nssv_noexcept { + return lhs.compare(rhs) > 0; + } + + // >= + + template <class CharT, class Traits nssv_MSVC_ORDER(1)> + nssv_constexpr bool operator>=(basic_string_view<CharT, Traits> lhs, + nssv_BASIC_STRING_VIEW_I(CharT, Traits) rhs) nssv_noexcept { + return lhs.compare(rhs) >= 0; + } + + template <class CharT, class Traits nssv_MSVC_ORDER(2)> + nssv_constexpr bool operator>=(nssv_BASIC_STRING_VIEW_I(CharT, Traits) lhs, + basic_string_view<CharT, Traits> rhs) nssv_noexcept { + return lhs.compare(rhs) >= 0; + } + +#undef nssv_MSVC_ORDER +#undef nssv_BASIC_STRING_VIEW_I + +#endif // compiler-dependent approach to comparisons + + // 24.4.4 Inserters and extractors: + + namespace detail { + + template <class Stream> void write_padding(Stream &os, std::streamsize n) { + for (std::streamsize i = 0; i < n; ++i) + os.rdbuf()->sputc(os.fill()); + } + + template <class Stream, class View> Stream &write_to_stream(Stream &os, View const &sv) { + typename Stream::sentry sentry(os); + + if (!os) + return os; + + const std::streamsize length = static_cast<std::streamsize>(sv.length()); + + // Whether, and how, to pad: + const bool pad = (length < os.width()); + const bool left_pad = pad && (os.flags() & std::ios_base::adjustfield) == std::ios_base::right; + + if (left_pad) + write_padding(os, os.width() - length); + + // Write span characters: + os.rdbuf()->sputn(sv.begin(), length); + + if (pad && !left_pad) + write_padding(os, os.width() - length); + + // Reset output stream width: + os.width(0); + + return os; + } + + } // namespace detail + + template <class CharT, class Traits> + std::basic_ostream<CharT, Traits> &operator<<(std::basic_ostream<CharT, Traits> &os, + basic_string_view<CharT, Traits> sv) { + return detail::write_to_stream(os, sv); + } + + // Several typedefs for common character types are provided: + + typedef basic_string_view<char> string_view; + typedef basic_string_view<wchar_t> wstring_view; +#if nssv_HAVE_WCHAR16_T + typedef basic_string_view<char16_t> u16string_view; + typedef basic_string_view<char32_t> u32string_view; +#endif + + } // namespace sv_lite +} // namespace nonstd::sv_lite + +// +// 24.4.6 Suffix for basic_string_view literals: +// + +#if nssv_HAVE_USER_DEFINED_LITERALS + +namespace nonstd { +nssv_inline_ns namespace literals { + nssv_inline_ns namespace string_view_literals { + +#if nssv_CONFIG_STD_SV_OPERATOR && nssv_HAVE_STD_DEFINED_LITERALS + + nssv_constexpr nonstd::sv_lite::string_view operator"" sv(const char *str, size_t len) nssv_noexcept // (1) + { + return nonstd::sv_lite::string_view {str, len}; + } + + nssv_constexpr nonstd::sv_lite::u16string_view operator"" sv(const char16_t *str, size_t len) nssv_noexcept // (2) + { + return nonstd::sv_lite::u16string_view {str, len}; + } + + nssv_constexpr nonstd::sv_lite::u32string_view operator"" sv(const char32_t *str, size_t len) nssv_noexcept // (3) + { + return nonstd::sv_lite::u32string_view {str, len}; + } + + nssv_constexpr nonstd::sv_lite::wstring_view operator"" sv(const wchar_t *str, size_t len) nssv_noexcept // (4) + { + return nonstd::sv_lite::wstring_view {str, len}; + } + +#endif // nssv_CONFIG_STD_SV_OPERATOR && nssv_HAVE_STD_DEFINED_LITERALS + +#if nssv_CONFIG_USR_SV_OPERATOR + + nssv_constexpr nonstd::sv_lite::string_view operator"" _sv(const char *str, size_t len) nssv_noexcept // (1) + { + return nonstd::sv_lite::string_view {str, len}; + } + + nssv_constexpr nonstd::sv_lite::u16string_view operator"" _sv(const char16_t *str, size_t len) nssv_noexcept // (2) + { + return nonstd::sv_lite::u16string_view {str, len}; + } + + nssv_constexpr nonstd::sv_lite::u32string_view operator"" _sv(const char32_t *str, size_t len) nssv_noexcept // (3) + { + return nonstd::sv_lite::u32string_view {str, len}; + } + + nssv_constexpr nonstd::sv_lite::wstring_view operator"" _sv(const wchar_t *str, size_t len) nssv_noexcept // (4) + { + return nonstd::sv_lite::wstring_view {str, len}; + } + +#endif // nssv_CONFIG_USR_SV_OPERATOR + } +} +} // namespace nonstd + +#endif + +// +// Extensions for std::string: +// + +#if nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS + +namespace nonstd { +namespace sv_lite { + +// Exclude MSVC 14 (19.00): it yields ambiguous to_string(): + +#if nssv_CPP11_OR_GREATER && nssv_COMPILER_MSVC_VERSION != 140 + +template <class CharT, class Traits, class Allocator = std::allocator<CharT>> +std::basic_string<CharT, Traits, Allocator> to_string(basic_string_view<CharT, Traits> v, + Allocator const &a = Allocator()) { + return std::basic_string<CharT, Traits, Allocator>(v.begin(), v.end(), a); +} + +#else + +template <class CharT, class Traits> std::basic_string<CharT, Traits> to_string(basic_string_view<CharT, Traits> v) { + return std::basic_string<CharT, Traits>(v.begin(), v.end()); +} + +template <class CharT, class Traits, class Allocator> +std::basic_string<CharT, Traits, Allocator> to_string(basic_string_view<CharT, Traits> v, Allocator const &a) { + return std::basic_string<CharT, Traits, Allocator>(v.begin(), v.end(), a); +} + +#endif // nssv_CPP11_OR_GREATER + +template <class CharT, class Traits, class Allocator> +basic_string_view<CharT, Traits> to_string_view(std::basic_string<CharT, Traits, Allocator> const &s) { + return basic_string_view<CharT, Traits>(s.data(), s.size()); +} + +} // namespace sv_lite +} // namespace nonstd + +#endif // nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS + +// +// make types and algorithms available in namespace nonstd: +// + +namespace nonstd { + +using sv_lite::basic_string_view; +using sv_lite::string_view; +using sv_lite::wstring_view; + +#if nssv_HAVE_WCHAR16_T +using sv_lite::u16string_view; +#endif +#if nssv_HAVE_WCHAR32_T +using sv_lite::u32string_view; +#endif + +// literal "sv" + +using sv_lite::operator==; +using sv_lite::operator!=; +using sv_lite::operator<; +using sv_lite::operator<=; +using sv_lite::operator>; +using sv_lite::operator>=; + +using sv_lite::operator<<; + +#if nssv_CONFIG_CONVERSION_STD_STRING_FREE_FUNCTIONS +using sv_lite::to_string; +using sv_lite::to_string_view; +#endif + +} // namespace nonstd + +// 24.4.5 Hash support (C++11): + +// Note: The hash value of a string view object is equal to the hash value of +// the corresponding string object. + +#if nssv_HAVE_STD_HASH + +#include <functional> + +namespace std { + +template <> struct hash<nonstd::string_view> { +public: + std::size_t operator()(nonstd::string_view v) const nssv_noexcept { + return std::hash<std::string>()(std::string(v.data(), v.size())); + } +}; + +template <> struct hash<nonstd::wstring_view> { +public: + std::size_t operator()(nonstd::wstring_view v) const nssv_noexcept { + return std::hash<std::wstring>()(std::wstring(v.data(), v.size())); + } +}; + +template <> struct hash<nonstd::u16string_view> { +public: + std::size_t operator()(nonstd::u16string_view v) const nssv_noexcept { + return std::hash<std::u16string>()(std::u16string(v.data(), v.size())); + } +}; + +template <> struct hash<nonstd::u32string_view> { +public: + std::size_t operator()(nonstd::u32string_view v) const nssv_noexcept { + return std::hash<std::u32string>()(std::u32string(v.data(), v.size())); + } +}; + +} // namespace std + +#endif // nssv_HAVE_STD_HASH + +nssv_RESTORE_WARNINGS() + +#endif // nssv_HAVE_STD_STRING_VIEW +#endif // NONSTD_SV_LITE_H_INCLUDED |