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* [Bug c++/57745] New: missing recursive lifetime extension within std::initializer_list
@ 2013-06-27 23:08 richard-gccbugzilla at metafoo dot co.uk
2013-06-27 23:22 ` [Bug c++/57745] " paolo.carlini at oracle dot com
0 siblings, 1 reply; 2+ messages in thread
From: richard-gccbugzilla at metafoo dot co.uk @ 2013-06-27 23:08 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57745
Bug ID: 57745
Summary: missing recursive lifetime extension within
std::initializer_list
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: richard-gccbugzilla at metafoo dot co.uk
Consider:
#include <iostream>
struct A {
A() { std::cout << " A()" << std::endl; }
~A() { std::cout << "~A()" << std::endl; }
};
struct B {
const A &a;
~B() { std::cout << "~B()" << std::endl; }
};
struct C {
std::initializer_list<B> b;
~C() { std::cout << "~C()" << std::endl; }
};
int main() {
const C &c = C{ { { A() }, { A() } } };
std::cout << "-----" << std::endl;
}
This should print:
A()
A()
-----
~C()
~B()
~A()
~B()
~A()
... but g++ destroys the two A temporaries at the end of the full-expression.
They are lifetime-extended because they are bound to B::a references in the
aggregate-initialization of the B subobjects of the underlying array of the
initializer_list, which is itself lifetime-extended.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug c++/57745] missing recursive lifetime extension within std::initializer_list
2013-06-27 23:08 [Bug c++/57745] New: missing recursive lifetime extension within std::initializer_list richard-gccbugzilla at metafoo dot co.uk
@ 2013-06-27 23:22 ` paolo.carlini at oracle dot com
0 siblings, 0 replies; 2+ messages in thread
From: paolo.carlini at oracle dot com @ 2013-06-27 23:22 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57745
--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> ---
First blush seems related to PR54293, but I didn't study the latter seriously
enough.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2013-06-27 23:08 [Bug c++/57745] New: missing recursive lifetime extension within std::initializer_list richard-gccbugzilla at metafoo dot co.uk
2013-06-27 23:22 ` [Bug c++/57745] " paolo.carlini at oracle dot com
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