From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- gcc/testsuite/g++.dg/init/elide1.C | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 gcc/testsuite/g++.dg/init/elide1.C (limited to 'gcc/testsuite/g++.dg/init/elide1.C') diff --git a/gcc/testsuite/g++.dg/init/elide1.C b/gcc/testsuite/g++.dg/init/elide1.C new file mode 100644 index 000000000..24e81e387 --- /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; +} -- cgit v1.2.3