Difference between revisions of "cpp/numeric/ratio/ratio greater equal"
From cppreference.com
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(+= `example`) |
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{{example | | {{example | | ||
| code= | | code= | ||
| + | #include <ratio> | ||
| + | #include <iostream> | ||
| + | |||
| + | auto main() -> int | ||
| + | { | ||
| + | static_assert(std::ratio_greater_equal< | ||
| + | std::ratio<2, 3>, | ||
| + | std::ratio<2, 3>>::value, "2/3 >= 2/3"); | ||
| + | |||
| + | if (std::ratio_greater_equal< | ||
| + | std::ratio<2,1>, std::ratio<1, 2>>::value) { | ||
| + | std::cout << "2/1 >= 1/2" "\n"; | ||
| + | } | ||
| + | |||
| + | if (std::ratio_greater_equal< | ||
| + | std::ratio<1,2>, std::ratio<1, 2>>::value) { | ||
| + | std::cout << "1/2 >= 1/2" "\n"; | ||
| + | } | ||
| + | |||
| + | // Since C++17 | ||
| + | static_assert(std::ratio_greater_equal_v< | ||
| + | std::ratio<999'999, 1'000'000>, | ||
| + | std::ratio<999'998, 999'999>> ); | ||
| + | |||
| + | if constexpr (std::ratio_greater_equal_v< | ||
| + | std::ratio<999'999, 1'000'000>, | ||
| + | std::ratio<999'998, 999'999>>) { | ||
| + | std::cout << "999'999/1'000'000 >= 999'998/999'999" "\n"; | ||
| + | } | ||
| + | if constexpr (std::ratio_greater_equal_v< | ||
| + | std::ratio<999'999, 1'000'000>, | ||
| + | std::ratio<999'999, 1'000'000>>) { | ||
| + | std::cout << "999'999/1'000'000 >= 999'999/1'000'000" "\n"; | ||
| + | } | ||
| + | } | ||
| output= | | output= | ||
| + | 2/1 >= 1/2 | ||
| + | 1/2 >= 1/2 | ||
| + | 999'999/1'000'000 >= 999'998/999'999 | ||
| + | 999'999/1'000'000 >= 999'999/1'000'000 | ||
}} | }} | ||
Revision as of 17:46, 23 April 2020
| Defined in header <ratio>
|
||
| template< class R1, class R2 > struct ratio_greater_equal : std::integral_constant<bool, /* see below */> { }; |
(since C++11) | |
If the ratio R1 is greater than or equal to the ratio R2, provides the member constant value equal true. Otherwise, value is false.
Contents |
Helper variable template
| template< class R1, class R2 > inline constexpr bool ratio_greater_equal_v = ratio_greater_equal<R1, R2>::value; |
(since C++17) | |
Inherited from std::integral_constant
Member constants
| value [static] |
true if R1::num * R2::den >= R2::num * R1::den, or equivalent expression that avoids overflow , 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> |
Example
Run this code
#include <ratio> #include <iostream> auto main() -> int { static_assert(std::ratio_greater_equal< std::ratio<2, 3>, std::ratio<2, 3>>::value, "2/3 >= 2/3"); if (std::ratio_greater_equal< std::ratio<2,1>, std::ratio<1, 2>>::value) { std::cout << "2/1 >= 1/2" "\n"; } if (std::ratio_greater_equal< std::ratio<1,2>, std::ratio<1, 2>>::value) { std::cout << "1/2 >= 1/2" "\n"; } // Since C++17 static_assert(std::ratio_greater_equal_v< std::ratio<999'999, 1'000'000>, std::ratio<999'998, 999'999>> ); if constexpr (std::ratio_greater_equal_v< std::ratio<999'999, 1'000'000>, std::ratio<999'998, 999'999>>) { std::cout << "999'999/1'000'000 >= 999'998/999'999" "\n"; } if constexpr (std::ratio_greater_equal_v< std::ratio<999'999, 1'000'000>, std::ratio<999'999, 1'000'000>>) { std::cout << "999'999/1'000'000 >= 999'999/1'000'000" "\n"; } }
Output:
2/1 >= 1/2 1/2 >= 1/2 999'999/1'000'000 >= 999'998/999'999 999'999/1'000'000 >= 999'999/1'000'000
