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Language Extensions
Errors
The compiler generates a warning if it detects arithmetic on void pointers or function
pointers.
Example
int ptr_arith_0(void)
{
void * pointer;
return sizeof *pointer;
}
int ptr_arith_1(void)
{
static int diff;
diff = ptr_arith_0 - ptr_arith_1;
return sizeof ptr_arith_0;
}
3.7.14 Statement expressions
Statement expressions enable you to place whole sections of code, including
declarations, within braces ({ }) .
The result of a statement expression is the final item in the statement list.
Restrictions
Branches into a statement expression are not allowed.
In C++ mode, branches out are also not allowed. Variable-length arrays, destructible
entities, try, catch, local non-POD class definitions, and dynamically initialized local
static variables are not allowed inside a statement expression.
Example
int bar(int b, int foo)
{
if (({
int y = foo;
int z;
if (y > 0) z = y;
else z = -y;
z>b;
}))
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