>From: "John Maddock" <[EMAIL PROTECTED]>
> Can whoever added this one, please add it to the docs (as a feature
macro).
>
> Is it possible to test for this? If so can a test program be supplied
> please - the test program should compile and run only if the feature is
> available - see one of the boost_has_XXX.cxx files for examples.
I've looked at the test-programs, there, but it wasn't clear to me in what
way it is preferred that the program fails to run (e.g. throwing an
exception), or if returning a non-zero value is enough. In any case, the
program below detects presence of NRVO, by returning zero, or greater than
zero if NRVO is not present.
Usage:
int result=boost_has_nrvo::test();
namespace boost_has_nrvo
{
class test_class
{
public:
test_class() {}
test_class(const test_class &other)
{
++copy_count;
}
static int copy_count;
};
int test_class::copy_count;
test_class f()
{
test_class nrv;
return nrv;
}
int test()
{
test_class::copy_count=0;
f();
return test_class::copy_count;
}
} // namespace boost_has_nrvo
Regards,
Terje
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