std::numeric_limits::is_modulo
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| static const bool is_modulo |
(até C++11) | |
| static constexpr bool is_modulo |
(desde C++11) | |
The value of std::numeric_limits<T>::is_modulo is true for all arithmetic types T that handle overflows with modulo arithmetic, that is, if the result of addition, subtraction, multiplication, or division of this type would fall outside the range [min(), max()], the value returned by such operation differs from the expected value by a multiple of max()-min()+1.
[editar] Especializações padrão
T
|
valor de std::numeric_limits<T>::is_modulo
Original: value of std::numeric_limits<T>::is_modulo The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. |
| /* non-specialized */ | false |
| bool | false |
| char | true |
| signed char | true |
| unsigned char | true |
| wchar_t | true |
| char16_t | true |
| char32_t | true |
| short | true |
| unsigned short | true |
| int | true |
| unsigned int | true |
| long | true |
| unsigned long | true |
| long long | true |
| unsigned long long | true |
| float | false |
| double | false |
| long double | false |
[editar] Exemplo
Demonstrates the behavior of modulo types
#include <iostream> #include <type_traits> #include <limits> template<class T> typename std::enable_if<std::numeric_limits<T>::is_modulo>::type check_overflow() { std::cout << "\nmax value is " << std::numeric_limits<T>::max() << '\n' << "min value is " << std::numeric_limits<T>::min() << '\n' << "max value + 1 is " << std::numeric_limits<T>::max()+1 << '\n'; } int main() { check_overflow<int>(); check_overflow<unsigned long>(); // check_overflow<float>(); // compile-time error, not a modulo type }
Saída:
max value is 2147483647 min value is -2147483648 max value + 1 is -2147483648 max value is 18446744073709551615 min value is 0 max value + 1 is 0
[editar] Veja também
| [estática] |
identifica os tipos inteiros Original: identifies integer types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (membro estático público constante) |
| [estática] |
identifica os IEC 559/IEEE 754 tipos de ponto flutuante Original: identifies the IEC 559/IEEE 754 floating-point types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (membro estático público constante) |
| [estática] |
identifica os tipos de exatas Original: identifies exact types The text has been machine-translated via Google Translate. You can help to correct and verify the translation. Click here for instructions. (membro estático público constante) |
