std::ratio_equal
From cppreference.com
                    
                                        
                    
                    
                                                            
                    | 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.
| Contents | 
[edit] 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> | 
[edit] Possible implementation
| template< class R1, class R2 > struct ratio_equal : public std::integral_constant < bool, R1::num == R2::num && R1::den == R2::den > {}; | 
[edit] 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
[edit] See also
| (library fundamentals TS) | variable template alias of std::ratio_equal::value(variable template) | 


