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* [Bug c++/65816] New: Constructor delegation does not perform zero-initialization
@ 2015-04-20 16:22 dyp-cpp at gmx dot net
  2015-04-20 16:26 ` [Bug c++/65816] " redi at gcc dot gnu.org
                   ` (8 more replies)
  0 siblings, 9 replies; 10+ messages in thread
From: dyp-cpp at gmx dot net @ 2015-04-20 16:22 UTC (permalink / raw)
  To: gcc-bugs

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65816

            Bug ID: 65816
           Summary: Constructor delegation does not perform
                    zero-initialization
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dyp-cpp at gmx dot net

In the following program, I expect the object `t` to be zero-initialized via
constructor delegation. Clang++ does this, but g++ 6.0 2015-04-20 does not.

-----------------------------

struct test
{
    int m;

    test() = default;
    test(int) : test() {}
};

#include <iostream>

int main()
{
    test t(0);
    std::cout << t.m;
}

-----------------------------

While C++14 IS [class.base.init]p6 is unclear about this, as far as I can tell,
paragraph 7 implies (in the parenthesized clause) that the constructor
`test(int)` is required to value-initialize the object:

> The expression-list or braced-init-list in a mem-initializer is used to initialize the designated subobject (or, in the case of a delegating constructor, the complete class object) according to the initialization rules of 8.5 for direct-initialization.

The class `test` does not have a user-provided default constructor, hence
zero-initialization should be performed as per [dcl.init]p8.2


^ permalink raw reply	[flat|nested] 10+ messages in thread
end of thread, other threads:[~2021-11-26 16:34 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2015-04-20 16:22 [Bug c++/65816] New: Constructor delegation does not perform zero-initialization dyp-cpp at gmx dot net
2015-04-20 16:26 ` [Bug c++/65816] " redi at gcc dot gnu.org
2020-08-27 19:19 ` johelegp at gmail dot com
2021-05-31 13:53 ` zcsfjvvwjsgomjypri at twzhhq dot com
2021-06-01 17:37 ` ppalka at gcc dot gnu.org
2021-06-01 20:21 ` cvs-commit at gcc dot gnu.org
2021-06-02 12:33 ` cvs-commit at gcc dot gnu.org
2021-09-01 14:24 ` ppalka at gcc dot gnu.org
2021-10-12 19:41 ` cvs-commit at gcc dot gnu.org
2021-11-26 16:34 ` cvs-commit at gcc dot gnu.org

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