ckd_mul - cppreference.com (original) (raw)

| | | | | ----------------------------------------------------------------------------------------------------- | | ------------- | | template< class type1, class type2, class type3 > bool ckd_mul( type1* result, type2 a, type3 b ); | | (since C++26) |

Computes the multiplication x × y and stores the result into *result. The multiplication is performed as if both operands were represented in a signed integer type with infinite range, and the result was then converted from this integer type to type1. If the value assigned to *result correctly represents the mathematical result of the operation, it returns false. Otherwise, it returns true. In this case, the value assigned to *result is the mathematical result of the operation wrapped around to the width of *result.

[edit] Parameters

a, b	-	integer values
result	-	address of where result should be stored

[edit] Return value

false if the value assigned to *result correctly represents the mathematical result of the multiplication, true otherwise.

[edit] Note

The function template ckd_mul has the same semantics as the corresponding type-generic macro with the same name specified in C23.

Each of the types type1, type2, and type3 is a cv-unqualified signed or unsigned integer type.

It is recommended to produce a diagnostic message if type2 or type3 are not suitable integer types, or if *result is not a modifiable lvalue of a suitable integer type.

[edit] Example

[edit] References