class template
<ratio>

std::ratio_equal

template <class R1, class R2> ratio_equal;
Compare ratios
This type inherits from the appropriate integral_constant type (either true_type or false_type) to signal whether R1 compares equal to R2
The resulting type is the same as if ratio_equal was defined as:
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template <class R1, class R2>
struct ratio_equal : integral_constant<bool, R1::num==R2::num && R1::den==R2::den> {};

Template parameters

R1,R2
ratio types to be compared.

Member constants

Inherited from integral_constant:
member constantdefinition
valueeither true or false

Member types

Inherited from integral_constant:
member typedefinition
value_typebool
typeeither true_type or false_type

Example

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// ratio_equal example
#include <iostream>
#include <ratio>

int main ()
{
  typedef std::ratio<1,2> one_half;
  typedef std::ratio<2,4> two_fourths;

  std::cout << "1/2 == 2/4 ? " << std::boolalpha;
  std::cout << std::ratio_equal<one_half,two_fourths>::value << std::endl;

  return 0;
}

Output:
1/2 == 2/4 ? true


See also