Difference between revisions of "cpp/numeric/ratio/ratio equal"
From cppreference.com
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− | If the ratios R1 and R2 are equal, provides the member constant {{tt|value}} equal {{ | + | If the ratios R1 and R2 are equal, provides the member constant {{tt|value}} equal {{|true}}. Otherwise, {{tt|value}} is {{|false}}. |
− | {{cpp/types/integral_constant/inherit | {{ | + | {{cpp/types/integral_constant/inherit | {{|1=R1::num == R2::num && R1::den == R2::den}} }} |
===Possible implementation=== | ===Possible implementation=== |
Revision as of 21:36, 19 April 2012
Template:cpp/numeric/ratio/sidebar Template:ddcl list begin <tr class="t-dsc-header">
<td>Defined in header
</td>
<ratio>
<td></td> <td></td> </tr> <tr class="t-dcl ">
<td class="t-dcl-nopad">template< class R1, class R2 >
struct ratio_equal : std::integral_constant;
</td>
struct ratio_equal : std::integral_constant;
<td class="t-dcl-nopad"> </td> <td class="t-dcl-nopad"> </td> </tr> Template:ddcl list end
If the ratios R1 and R2 are equal, provides the member constant value
equal true. Otherwise, value
is false.
Contents |
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
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