class template
<ratio>

std::ratio_add

template <class R1, class R2> ratio_add;
Add two ratios
This class template alias generates a ratio type that is the sum of the ratio types R1 and R2.

The resulting type is the same as if ratio_add was defined as:
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template <typename R1, typename R2>
using ratio_add = ratio < R1::num*R2::den+R2::num*R1::den, R1::den*R2::den >;

A program shall not cause any expression in the above definition to expand to values not representable as an intmax_t.

Template parameters

R1,R2
ratio types to be added.

Member constants

The same as ratio (ratio_add is merely a template alias).
member constexprdescription
numNumerator
denDenominator

The values of num and den represent the result of the addition operation.

Member types

The same as ratio (ratio_add is merely a template alias).
member typedefinitiondescription
typeratio<num,den>The ratio type with the result of the addition.

Example

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

int main ()
{
  typedef std::ratio<1,2> one_half;
  typedef std::ratio<2,3> two_thirds;

  typedef std::ratio_add<one_half,two_thirds> sum;

  std::cout << "sum = " << sum::num << "/" << sum::den;
  std::cout << " (which is: " << ( double(sum::num) / sum::den ) << ")" << std::endl;

  return 0;
}

Output:
sum = 7/6 (which is: 1.166667)


See also