This diagnostic rule is based on the software development guidelines developed by MISRA (Motor Industry Software Reliability Association).
It is possible to call a non-void function without using its return value afterward. There could be an error behind such behavior.
Values returned by non-void functions must always be used. Example of non-compliant code:
int Foo(int x)
{
return x + x;
}
void Bar(int x)
{
Foo(x);
}If the loss of the return value was planned by the developer, it can be cast to the type 'void'. Example of compliant code:
void Bar(int x)
{
(void)Foo(x);
}This diagnostic is classified as:
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