namespace std {
// operator<=>により、以下の演算子が使用可能になる (C++20)
template <class CharT, class Traits, class Allocator>
bool
operator>=(const basic_string<CharT, Traits, Allocator>& a,
const basic_string<CharT, Traits, Allocator>& b); // (1) C++03
template <class CharT, class Traits, class Allocator>
bool
operator>=(const basic_string<CharT, Traits, Allocator>& a,
const basic_string<CharT, Traits, Allocator>& b) noexcept; // (1) C++14
template <class CharT, class Traits, class Allocator>
constexpr bool
operator>=(const basic_string<CharT, Traits, Allocator>& a,
const basic_string<CharT, Traits, Allocator>& b) noexcept; // (1) C++20
template <class CharT, class Traits, class Allocator>
bool
operator>=(const CharT* a,
const basic_string<CharT, Traits, Allocator>& b); // (2) C++03
template <class CharT, class Traits, class Allocator>
constexpr bool
operator>=(const CharT* a,
const basic_string<CharT, Traits, Allocator>& b); // (2) C++20
template <class CharT, class Traits, class Allocator>
bool
operator>=(const basic_string<CharT, Traits, Allocator>& a,
const CharT* b); // (3) C++03
template <class CharT, class Traits, class Allocator>
constexpr bool
operator>=(const basic_string<CharT, Traits, Allocator>& a,
const CharT* b); // (3) C++20
}
概要
basic_string
において、左辺が右辺以上かの判定を行う。
戻り値
例
#include <iostream>
#include <string>
int main()
{
std::string a = "bbb";
std::string b = "aaa";
std::cout << std::boolalpha;
std::cout << (a >= b) << std::endl;
}
出力
true
参照
- LWG2064 - More
noexcept
issues inbasic_string
- P0980R1 Making
std::string
constexpr - P1614R2 The Mothership has Landed
- C++20での三方比較演算子の追加と、関連する演算子の自動導出