diff --git a/gcc/testsuite/g++.dg/init/elide1.C b/gcc/testsuite/g++.dg/init/elide1.C new file mode 100644 index 0000000000000000000000000000000000000000..24e81e387e55d35ca60d529e26aef503abd4ff41 --- /dev/null +++ b/gcc/testsuite/g++.dg/init/elide1.C @@ -0,0 +1,38 @@ +// { dg-do run } + +// Test that the destructor for a temporary passed by value isn't run +// until end of full-expression, as per [class.copy]: + +// Whenever a temporary class object is copied using a copy constructor, +// and this object and the copy have the same cv-unqualified type, an +// implementation is permitted to treat the original and the copy as two +// different ways of referring to the same object and not perform a copy +// at all, even if the class copy constructor or destructor have side +// effects.... In these cases, the +// object is destroyed at the later of times when the original and the +// copy would have been destroyed without the optimization. + +// Here, the temporary would be destroyed later than the parm, so either we +// must suppress the optimization in this case or destroy value parms in the +// caller. + +int d; + +struct A { + A () { } + A (const A&) { } + ~A() { ++d; } +}; + +void f (A a) { } + +int main () +{ + int r; + f (A ()), r = d; + + if (r < d && d) + return 0; + else + return 1; +}