c26486.md

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Learn more about: C26486 LIFETIMES_FUNCTION_PRECONDITION_VIOLATION	C26486	12/14/2018	conceptual	C26486	C26486	d5395efc-5eb2-4e82-9b45-fcd5ff4577bf	kylereedmsft	kylereed

C26486 LIFETIMES_FUNCTION_PRECONDITION_VIOLATION

Don't pass a pointer that may be invalid (dangling) as a parameter to a function.

void use(int*);

void ex1()
{
    int* px;
    {
        int x;
        px = &x;
    }

    use(px);  // px is a dangling pointer
}

Remarks

The Lifetime guidelines from the C++ core guidelines outline a contract that code can follow which will enable more thorough static memory leak and dangling pointer detection. The basic ideas behind the guidelines are:

• Never dereference an invalid (dangling) or known-null pointer
• Never return (either formal return or out parameter) any pointer from a function.
• Never pass an invalid (dangling) pointer to any function.

See also

• C++ Core Guidelines Lifetimes Paper