std::ratio_less_equal

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Metaprogramming library

Type traits

Type categories

is_void

(C++11)

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(C++11)(DR*)

is_array (C++11)
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is_union (C++11)
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(C++11)

(C++11)

(C++11)

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(C++11)

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(C++11)

(C++11)

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Type trait constants

integral_constantbool_constanttrue_typefalse_type

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Metafunctions

conjunction

(C++17)

disjunction

(C++17)

negation

(C++17)

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is_constructibleis_trivially_constructibleis_nothrow_constructible (C++11)(C++11)(C++11)
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is_copy_constructibleis_trivially_copy_constructibleis_nothrow_copy_constructible (C++11)(C++11)(C++11)
is_move_constructibleis_trivially_move_constructibleis_nothrow_move_constructible (C++11)(C++11)(C++11)
is_assignableis_trivially_assignableis_nothrow_assignable (C++11)(C++11)(C++11)

is_copy_assignableis_trivially_copy_assignableis_nothrow_copy_assignable (C++11)(C++11)(C++11)
is_move_assignableis_trivially_move_assignableis_nothrow_move_assignable (C++11)(C++11)(C++11)
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is_base_of (C++11)
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aligned_storage (C++11)(deprecated in C++23)
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conditional (C++11)
common_type (C++11)
common_reference (C++20)
underlying_type (C++11)
type_identity (C++20)
enable_if (C++11)
void_t (C++17)

Compile-time rational arithmetic

Compile-time integer sequences

integer_sequence

(C++14)

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Compile time rational arithmetic

ratio (C++11)
Arithmetic
ratio_add (C++11)
ratio_subtract (C++11)
ratio_multiply (C++11)
ratio_divide (C++11)
Comparison
ratio_equal (C++11)
ratio_not_equal (C++11)
ratio_less (C++11)
ratio_less_equal (C++11)
ratio_greater (C++11)
ratio_greater_equal (C++11)

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Defined in header`<ratio>`
template<class R1,class R2> struct ratio_less_equal:std::integral_constant<bool,/* see below */>{};		(since C++11)

If the ratioR1 is less than or equal to the ratioR2, provides the member constantvalue equaltrue. Otherwise,value isfalse.

[edit]Helper variable template

template<class R1,class R2> constexprbool ratio_less_equal_v= ratio_less_equal<R1, R2>::value;		(since C++17)

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Inherited fromstd::integral_constant

Member constants

value

[static]

true ifR1::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 tobool, returnsvalue (public member function)
operator() (C++14)	returnsvalue (public member function)

Member types

Type	Definition
`value_type`	bool
`type`	std::integral_constant<bool, value>

[edit]Example

Run this code

#include <iostream>#include <ratio> int main(){    static_assert(std::ratio_less_equal<std::ratio<1,2>,std::ratio<3,4>>::value,"1/2 <= 3/4"); if(std::ratio_less_equal<std::ratio<10,11>,std::ratio<11,12>>::value)std::cout<<"10/11 <= 11/12""\n";     static_assert(std::ratio_less_equal_v<std::ratio<10,11>,std::ratio<11,12>>); ifconstexpr(std::ratio_less_equal_v<std::ratio<10,11>,std::ratio<11,12>>)std::cout<<"11/12 <= 12/13""\n";}

Output:

10/11 <= 11/1211/12 <= 12/13

[edit]See also

ratio_equal (C++11)	compares two`ratio` objects for equality at compile-time (class template)[edit]
ratio_not_equal (C++11)	compares two`ratio` objects for inequality at compile-time (class template)[edit]