std::is_arithmetic
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| Defined in header <type_traits>
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| template< class T > struct is_arithmetic; |
(C + + 11以来) | |
If T is an arithmetic type (that is, an integral type or a floating-point type), provides the member constant value equal true. For any other type, value is false.
目次 |
Inherited from std::integral_constant
Member constants
| value [静的] |
true T is an arithmetic type もし、そうでなければfalse Original: true if T is an arithmetic type , false otherwise The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (公共の静的メンバ定数) |
Member functions
| operator bool |
boolにオブジェクトは、 value返しに変換します Original: converts the object to bool, returns value The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (パブリックメンバ関数) |
Member types
| タイプ
Original: Type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
Definition |
value_type
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bool
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type
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std::integral_constant<bool, value> |
[編集] ノート
Arithmetic types are the types for which the built-in 算術演算子 (+, -, *, /) are defined (possibly in combination with the usual arithmetic conversions)
Specializations of std::numeric_limits are provided for all arithmetic types.
[編集] 可能な実装
template< class T > struct is_arithmetic : std::integral_constant<bool, std::is_integral<T>::value || std::is_floating_point<T>::value> {}; |
[編集] 例
#include <iostream> #include <type_traits> class A {}; int main() { std::cout << std::boolalpha; std::cout << std::is_arithmetic<A>::value << '\n'; std::cout << std::is_arithmetic<int>::value << '\n'; std::cout << std::is_arithmetic<int&>::value << '\n'; std::cout << std::is_arithmetic<int*>::value << '\n'; std::cout << std::is_arithmetic<float>::value << '\n'; std::cout << std::is_arithmetic<float&>::value << '\n'; std::cout << std::is_arithmetic<float*>::value << '\n'; }
Output:
false true false false true false false
[編集] も参照してください
| (C++11) |
タイプかどうかをチェックするには、整数型です Original: checks if a type is integral type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (クラステンプレート) |
| (C++11) |
タイプかどうかをチェックするには、浮動小数点型である Original: checks if a type is floating-point type The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (クラステンプレート) |