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(1) |
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bool isless( float x, float y ); bool isless( double x, double y ); bool isless( long double x, long double y );
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(since C++11)
(until C++23) |
| constexpr bool isless( /* floating-point-type */ x, {{#pad:|6}} /* floating-point-type */ y );
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(since C++23) |
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| template< class Arithmetic1, class Arithmetic2 > bool isless( Arithmetic1 x, Arithmetic2 y );
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(A) |
(since C++11)
(constexpr since C++23) |
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1) Determines if the floating point number x is less than the floating-point number y, without setting floating-point exceptions. The library provides overloads for all cv-unqualified floating-point types as the type of the parameters x and y.(since C++23)
A) Additional overloads are provided for all other combinations of arithmetic types.
Parameters
| x, y
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-
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floating-point or integer values
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Return value
true if x < y, false otherwise.
Notes
The built-in operator< for floating-point numbers may raise FE_INVALID if one or both of the arguments is NaN. This function is a "quiet" version of operator<.
The additional overloads are not required to be provided exactly as (A). They only need to be sufficient to ensure that for their first argument num1 and second argument num2:
- If
num1 or num2 has type long double, then std::isless(num1, num2) has the same effect as std::isless(static_cast<long double>(num1),
{{#pad:|12}}static_cast<long double>(num2)).
- Otherwise, if
num1 and/or num2 has type double or an integer type, then std::isless(num1, num2) has the same effect as std::isless(static_cast<double>(num1),
{{#pad:|12}}static_cast<double>(num2)).
- Otherwise, if
num1 or num2 has type float, then std::isless(num1, num2) has the same effect as std::isless(static_cast<float>(num1),
{{#pad:|12}}static_cast<float>(num2)).
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(until C++23) |
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If num1 and num2 have arithmetic types, then std::isless(num1, num2) has the same effect as std::isless(static_cast</*common-floating-point-type*/>(num1),
{{#pad:|12}}static_cast</*common-floating-point-type*/>(num2)), where /*common-floating-point-type*/ is the floating-point type with the greatest floating-point conversion rank and greatest floating-point conversion subrank between the types of num1 and num2, arguments of integer type are considered to have the same floating-point conversion rank as double.
If no such floating-point type with the greatest rank and subrank exists, then overload resolution does not result in a usable candidate from the overloads provided.
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(since C++23) |
See also