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# operator<=> | ||
* flat_map[meta header] | ||
* std[meta namespace] | ||
* function template[meta id-type] | ||
* flat_map[meta class] | ||
* cpp23[meta cpp] | ||
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```cpp | ||
synth-three-way-result<value_type> | ||
operator<=>(const flat_map& x, | ||
const flat_map& y); // (1) C++23 | ||
``` | ||
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## 概要 | ||
`flat_map`オブジェクトの三方比較を行う。 | ||
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## テンプレートパラメータ制約 | ||
- 型 (`const`) `value_type` の値に対して`operator<=>`が定義されるか、型 (`const`) `value_type` の値に対して`operator<`が定義され全順序をもつこと | ||
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## 効果 | ||
```cpp | ||
return lexicographical_compare_three_way( | ||
x.begin(), x.end(), | ||
y.begin(), y.end(), | ||
synth-three-way); | ||
``` | ||
* lexicographical_compare_three_way[link /reference/algorithm/lexicographical_compare_three_way.md] | ||
* begin()[link begin.md] | ||
* end()[link end.md] | ||
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## 計算量 | ||
線形時間 | ||
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## 備考 | ||
- この演算子により、以下の演算子が使用可能になる: | ||
- `operator<` | ||
- `operator<=` | ||
- `operator>` | ||
- `operator>=` | ||
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## 例 | ||
```cpp example | ||
#include <iostream> | ||
#include <flat_map> | ||
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int main() | ||
{ | ||
stdx::flat_map<int, char> fm1 = { | ||
{3, 'a'}, | ||
{1, 'b'}, | ||
{4, 'c'} | ||
}; | ||
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stdx::flat_map<int, char> fm2 = { | ||
{3, 'a'}, | ||
{1, 'b'}, | ||
}; | ||
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std::cout << std::boolalpha; | ||
std::cout << ((fm1 <=> fm1) == 0) << std::endl; | ||
std::cout << (fm1 < fm2) << std::endl; | ||
std::cout << (fm1 <= fm1) << std::endl; | ||
std::cout << (fm1 > fm2) << std::endl; | ||
std::cout << (fm2 >= fm1) << std::endl; | ||
} | ||
``` | ||
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### 出力 | ||
``` | ||
true | ||
false | ||
true | ||
true | ||
false | ||
``` | ||
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## バージョン | ||
### 言語 | ||
- C++23 | ||
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### 処理系 | ||
- [Clang](/implementation.md#clang): ?? | ||
- [GCC](/implementation.md#gcc): ?? | ||
- [Visual C++](/implementation.md#visual_cpp): ?? | ||
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