Zdenek Dvorak wrote:
> umm... OK. Could you please provide an example (that could perhaps also
> be added to documentation) of how TARGET_EXPRs are used, that would
> explain the rationale behind this semantics?
The canonical example is:
struct S {
S();
S(const S&);
};
S f();
void g() {
S s = f();
}
Here, we want to elide the copy from f() into s; therefore, the value of
f() is represented as a TARGET_EXPR. Since it appears as the RHS of an
assignment, the middle end is required to pass the address of s to f,
rather than the address of a temporary, so that f will construct the
value directly into s.
--
Mark Mitchell
CodeSourcery
[EMAIL PROTECTED]
(650) 331-3385 x713
