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 >;
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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 constexpr | description |
|---|
| num | Numerator |
| den | Denominator |
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 type | definition | description |
|---|
| type | ratio<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;
}
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Output:
sum = 7/6 (which is: 1.166667)
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