Defined in header <ratio> | ||
---|---|---|
template< class R1, class R2 > struct ratio_equal : std::integral_constant; |
If the ratios R1 and R2 are equal, provides the member constant value
equal true
. Otherwise, value
is false
.
Helper variable template
template< class R1, class R2 > 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
#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
See also
std::experimental::ratio_equal_v
(library fundamentals TS) | variable template alias of std::ratio_equal::value (variable template) |
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