int LegacyFunction(const char *s) {
    // do something with s, like print it to standard output
    // this function does NOT retain any pointer to s after it returns.
    return strlen(s);
}

std::string ModernFunction() {
    // do something that returns a string
    return "Hello";
}

LegacyFunction(ModernFunction().c_str());

LegacyFunction(ModernFunction().c_str());

struct S {
S(int i): I(i) { }
int& v() { return I; }
private:
int I;
};
S s1(1); // full-expression is call of S::S(int)
S s2 = 2; // full-expression is call of S::S(int)
void f() {
if (S(3).v()) // full-expression includes lvalue-to-rvalue and
// int to bool conversions, performed before
// temporary is deleted at end of full-expression
{ }
}