std::ratio_equal
Defined in header <ratio> |
||
---|---|---|
template< class R1, class R2 > struct ratio_equal : std::integral_constant<bool, /* see below */> { }; |
(since C++11) |
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 > 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
#include <iostream> #include <ratio> int main() { constexpr bool equ = std::ratio_equal_v<std::ratio<2,3>, std::ratio<4,6>>; std::cout << "2/3 " << (equ ? "==" : "!=") << " 4/6\n"; }
Output:
2/3 == 4/6
See also
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https://en.cppreference.com/w/cpp/numeric/ratio/ratio_equal