c26454.md

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Learn more about: Arithmetic overflow: '%operator%' operation produces a negative unsigned result at compile time	C26454	C26454	01/08/2017	reference	C26454	C26454	C++

Arithmetic overflow: '%operator%' operation produces a negative unsigned result at compile time

This warning indicates that the subtraction operation produces a negative result which was evaluated in an unsigned context. This can result in unintended overflows.

Example

unsigned int negativeunsigned()
{
    const unsigned int x = 1u - 2u; // C26454 reported here
    return x;
}

To correct this warning, use the following code:

unsigned int negativeunsigned()
{
    const unsigned int x = 4294967295; // OK
    return x;
}

See also

ES.106: Don't try to avoid negative values by using unsigned