Difference between revisions of "cpp/numeric/ratio/ratio equal"
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Revision as of 04:58, 14 March 2017
| Defined in header <ratio>
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| template< class R1, class R2 > struct ratio_equal : std::integral_constant; |
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If the ratios R1 and R2 are equal, provides the member constant value equal true. Otherwise, value is false.
Contents |
Helper variable template
| template< class R1, class R2 > inline constexpr bool ratio_equal_v = ratio_equal<R1, R2>::value; |
(since C++17) | |
Inherited from std::integral_constant
Member constants
| value [static] |
true if R1::num == R2::num && R1::den == R2::den , false otherwise (public static member constant) |
Member functions
| operator bool |
converts the object to bool, returns value (public member function) |
| operator() (C++14) |
returns value (public member function) |
Member types
| Type | Definition |
value_type
|
bool |
type
|
std::integral_constant<bool, value> |
Possible implementation
template< class R1, class R2 > struct ratio_equal : public std::integral_constant < bool, R1::num == R2::num && R1::den == R2::den > {}; |
Example
Run this code
#include <iostream> #include <ratio> int main() { if(std::ratio_equal<std::ratio<2,3>, std::ratio<4,6>>::value) { std::cout << "2/3 == 4/6\n"; } else { std::cout << "2/3 != 4/6\n"; } }
Output:
2/3 == 4/6
