std::basic_string 的推导指引

 

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basic_string

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std::basic_string

成员函数 basic_string::basic_string basic_string::operator= basic_string::assign basic_string::get_allocator 元素访问 basic_string::at basic_string::operator[] basic_string::front (C++11) basic_string::back (C++11) basic_string::data basic_string::c_str basic_string::operator basic_string_view (C++17) 迭代器 basic_string::beginbasic_string::cbegin (C++11) basic_string::endbasic_string::cend (C++11) basic_string::rbeginbasic_string::crbegin (C++11) basic_string::rendbasic_string::crend (C++11) 容量 basic_string::empty basic_string::sizebasic_string::length basic_string::max_size basic_string::reserve basic_string::capacity basic_string::shrink_to_fit (C++11)

操作 basic_string::clear basic_string::insert basic_string::erase basic_string::push_back basic_string::pop_back (C++11) basic_string::append basic_string::operator+= basic_string::compare basic_string::replace basic_string::substr basic_string::copy basic_string::resize basic_string::swap 查找 basic_string::find basic_string::rfind basic_string::find_first_of basic_string::find_first_not_of basic_string::find_last_of basic_string::find_last_not_of 常量 basic_string::npos

非成员函数 operator+ operator==operator!=operator<operator>operator<=operator>= swap(std::basic_string) operator<<operator>> getline stoistolstoll (C++11) (C++11) (C++11) stoulstoull (C++11) (C++11) stofstodstold (C++11) (C++11) (C++11) to_string (C++11) to_wstring (C++11) operator""s (C++14) 帮助类 hash<std::string>hash<std::wstring>hash<std::u32string>hash<std::u16string> (C++11) (C++11) (C++11) (C++11) 推导指引(C++17)

 

定义于头文件 <string>
template<class InputIt, class Alloc = std::allocator<                           typename std::iterator_traits<InputIt>::value_type>> basic_string(InputIt, InputIt, Alloc = Alloc()) -> basic_string<typename std::iterator_traits<InputIt>::value_type,                 std::char_traits<typename std::iterator_traits<InputIt>::value_type>,                 Alloc>;		(C++17 起)

为 std::basic_string 提供此推导指引，以允许从迭代器范围推导。此重载仅若InputIt 满足输入迭代器 (InputIterator) 且 Alloc 满足分配器 (Allocator) 才参与重载决议

示例

运行此代码

#include <string>
#include <vector>
int main() {
   std::vector<char> v = {'a', 'b', 'c'};
   std::basic_string s{v.begin(), v.end()}; // 使用显式推导指引
}