实验库头文件 <experimental/string_view>

 

C++

编译器支持

独立和托管

语言

标准库

标准库头文件

命名要求

功能测试宏 (C++20)

语言支持库

概念库 (C++20)

元编程库 (C++11)

诊断库

通用实用程序库

字符串库

容器库

迭代器库

范围库 (C++20)

算法库

数值库

本地化库

输入/输出库

文件系统库 (C++17)

正则表达式库 (C++11)

并发支持库 (C++11)

执行支持库 (C++26)

技术规范

符号索引

外部库

 

标准库头文件

语言支持
<cstddef> <cstdlib> <version> (C++20) <limits> <climits>	<cfloat> <cstdint> (C++11) <stdfloat> (C++23) <new> <typeinfo>	<source_location> (C++20) <exception> <initializer_list> (C++11) <compare> (C++20)	<coroutine> (C++20) <csignal> <csetjmp> <cstdarg>
概念
<concepts> (C++20)
诊断
<stdexcept> <stacktrace> (C++23)	<cassert>	<cerrno>	<system_error> (C++11)
内存管理
<memory>	<memory_resource> (C++17)	<scoped_allocator> (C++11)
元编程
<type_traits> (C++11)	<ratio> (C++11)
通用实用程序
<utility> <tuple> (C++11) <optional> (C++17) <variant> (C++17)	<any> (C++17) <debugging> (C++26) <expected> (C++23) <bitset>	<functional> <typeindex> (C++11) <execution> (C++17)	<charconv> (C++17) <format> (C++20) <bit> (C++20)
字符串
<string_view> (C++17) <string>	<cctype> <cwctype>	<cstring> <cwchar>	<cuchar> (C++11)
容器
<array> (C++11) <deque> <forward_list> (C++11) <list>	<vector> <map> <set> <unordered_map> (C++11)	<unordered_set> (C++11) <queue> <stack> <flat_map> (C++23)	<flat_set> (C++23) <span> (C++20) <mdspan> (C++23) <inplace_vector> (C++26)
迭代器
<iterator>
范围
<ranges> (C++20)	<generator> (C++23)
算法
<algorithm>	<numeric>
数值
<cfenv> (C++11) <complex>	<random> (C++11) <valarray>	<cmath> <linalg> (C++26)	<numbers> (C++20)
时间
<chrono> (C++11)	<ctime>
本地化
<locale>	<clocale>	<codecvt> (C++11/17/26*)	<text_encoding> (C++26)
输入/输出
<iosfwd> <iostream> <ios> <streambuf>	<istream> <ostream> <iomanip> <print> (C++23)	<sstream> <spanstream> (C++23) <fstream> <syncstream> (C++20)	<filesystem> (C++17) <cstdio> <cinttypes> (C++11) <strstream> (C++98/26*)
正则表达式
<regex> (C++11)
并发支持
<stop_token> (C++20) <thread> (C++11) <atomic> (C++11) <rcu> (C++26)	<stdatomic.h> (C++23) <mutex> (C++11) <shared_mutex> (C++14)	<condition_variable> (C++11)   <semaphore> (C++20) <latch> (C++20)	<barrier> (C++20) <future> (C++11) <hazard_pointer> (C++26)
C 兼容性
<cstdbool> (C++11/17/20*)   <ccomplex> (C++11/17/20*)	<ctgmath> (C++11/17/20*)	<cstdalign> (C++11/17/20*)	<ciso646> (直到 C++20)

 

实验库头文件

执行 P2300
<experimental/execution>
文件系统 TS
<experimental/filesystem>
并行 TS (v1, v2)
experimental/algorithm experimental/execution_policy experimental/exception_list	experimental/numeric <experimental/simd> experimental/task_block
库基础 TS (v1, v2, v3)
experimental/algorithm <experimental/any> experimental/array experimental/chrono experimental/deque experimental/forward_list <experimental/functional> experimental/future experimental/iterator experimental/list experimental/map experimental/memory <experimental/memory_resource> experimental/numeric <experimental/optional> experimental/propagate_const	experimental/random experimental/ratio experimental/regex experimental/scope experimental/set experimental/source_location experimental/string <experimental/string_view> experimental/system_error experimental/tuple experimental/type_traits experimental/unordered_map experimental/unordered_set experimental/utility experimental/vector
并发 TS
experimental/atomic experimental/barrier	experimental/future experimental/latch
范围 TS
<experimental/ranges/algorithm> <experimental/ranges/concepts> <experimental/ranges/functional>         <experimental/ranges/iterator>	<experimental/ranges/random> <experimental/ranges/tuple> <experimental/ranges/type_traits> <experimental/ranges/utility>
协程 TS
experimental/coroutine
网络 TS
experimental/buffer experimental/executor experimental/internet experimental/io_context	<experimental/net> experimental/netfwd experimental/socket experimental/timer
反射 TS
<experimental/reflect>

 

此头文件是库基础 TS 的一部分（v1，v2）。

类

名称	描述
std::experimental::basic_string_view (库基础 TS)	表示字符字符串引用的类模板 (类模板)
std::experimental::string_view (库基础 TS)	std::experimental::basic_string_view<char> (typedef)
std::experimental::wstring_view (库基础 TS)	std::experimental::basic_string_view<wchar_t> (typedef)
std::experimental::u16string_view (库基础 TS)	std::experimental::basic_string_view<char16_t> (typedef)
std::experimental::u32string_view (库基础 TS)	std::experimental::basic_string_view<char32_t> (typedef)
std::hash<std::experimental::string_view> (库基础 TS)	(类模板特化)
std::hash<std::experimental::u16string_view> (库基础 TS)	(类模板特化)
std::hash<std::experimental::u32string_view> (库基础 TS)	(类模板特化)
std::hash<std::experimental::wstring_view> (库基础 TS)	(类模板特化)

函数

operator==operator!=operator<operator>operator<=operator>=	按字典顺序比较两个视图 (函数模板)
输出
operator<<	对视图执行流输出 (函数模板)

概要

namespace std {
  namespace experimental {
  inline namespace fundamentals_v1 {
 
    // 7.2, Class template basic_string_view
    template<class CharT, class Traits = char_traits<CharT>>
        class basic_string_view;
 
    // 7.9, basic_string_view non-member comparison functions
    template<class CharT, class Traits>
    constexpr bool operator==(basic_string_view<CharT, Traits> x,
                              basic_string_view<CharT, Traits> y) noexcept;
    template<class CharT, class Traits>
    constexpr bool operator!=(basic_string_view<CharT, Traits> x,
                              basic_string_view<CharT, Traits> y) noexcept;
    template<class CharT, class Traits>
    constexpr bool operator< (basic_string_view<CharT, Traits> x,
                                 basic_string_view<CharT, Traits> y) noexcept;
    template<class CharT, class Traits>
    constexpr bool operator> (basic_string_view<CharT, Traits> x,
                              basic_string_view<CharT, Traits> y) noexcept;
    template<class CharT, class Traits>
    constexpr bool operator<=(basic_string_view<CharT, Traits> x,
                                 basic_string_view<CharT, Traits> y) noexcept;
    template<class CharT, class Traits>
    constexpr bool operator>=(basic_string_view<CharT, Traits> x,
                              basic_string_view<CharT, Traits> y) noexcept;
    // /* see description */, sufficient additional overloads of comparison functions
 
    // 7.10, Inserters and extractors
    template<class CharT, class Traits>
      basic_ostream<CharT, Traits>&
        operator<<(basic_ostream<CharT, Traits>& os,
                   basic_string_view<CharT, Traits> str);
 
    // basic_string_view typedef names
    typedef basic_string_view<char> string_view;
    typedef basic_string_view<char16_t> u16string_view;
    typedef basic_string_view<char32_t> u32string_view;
    typedef basic_string_view<wchar_t> wstring_view;
 
  }  // namespace fundamentals_v1
  }  // namespace experimental
 
  // 7.11, Hash support
  template <class T> struct hash;
  template <> struct hash<experimental::string_view>;
  template <> struct hash<experimental::u16string_view>;
  template <> struct hash<experimental::u32string_view>;
  template <> struct hash<experimental::wstring_view>;
 
}  // namespace std