std::numeric_limits::is_modulo
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static const bool is_modulo |
(hasta 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.
Especializaciones estándar
T
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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
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bool
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false
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char
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true
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signed char
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true
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unsigned char
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true
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wchar_t
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true
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char16_t
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true
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char32_t
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true
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short
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true
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unsigned short
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true
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int
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true
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unsigned int
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true
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long
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true
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unsigned long
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true
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long long
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true
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unsigned long long
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true
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float
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false
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double
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false
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long double
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false
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Ejemplo
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
}
Salida:
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
Ver también
[estático] |
identifica los tipos enteros 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. (constante miembro pública estática) |
[estático] |
identifica los IEC 559/IEEE 754 tipos de punto flotante 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. (constante miembro pública estática) |
[estático] |
identifica los tipos exactos 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. (constante miembro pública estática) |