[Bug libstdc++/61791] New: [C++11] [constexpr] Additional overloads of std::real should be a constexpr function

[Bug libstdc++/61791] New: [C++11] [constexpr] Additional overloads of std::real should be a constexpr function

[kariya_mitsuru at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61791

            Bug ID: 61791
           Summary: [C++11] [constexpr] Additional overloads of std::real
                    should be a constexpr function
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: kariya_mitsuru at hotmail dot com

I think that the sample code below should be compiled successfully.

===========================================
#include <complex>

static constexpr double d = std::real(10);

int main() {}
===========================================

Note that it is compiled successfully if the argument is
std::complex<double>(10) instead of 10.

According to C++11 standard 26.4.9[cmplx.over] paragraph 2, "if either argument
has type complex<double>, double, or an integer type, then both arguments are
effectively cast to complex<double>."

Therefore, I think it should be compiled successfully too.

[Bug libstdc++/61791] [C++11] [constexpr] Additional overloads of std::real should be a constexpr function

[kariya_mitsuru at hotmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61791

--- Comment #1 from Mitsuru Kariya <kariya_mitsuru at hotmail dot com> ---
Sorry, the text which should be quoted was mistaken.

> According to C++11 standard 26.4.9[cmplx.over] paragraph 2, "if either
> argument has type complex<double>, double, or an integer type, then both
> arguments are effectively cast to complex<double>."

According to C++11 standard 26.4.9[cmplx.over] paragraph 2, "if the argument
has type double or an integer type, then it is effectively cast to
complex<double>."

[Bug libstdc++/61791] [C++11] [constexpr] Additional overloads of std::real should be a constexpr function

[daniel.kruegler at googlemail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61791

Daniel Krügler <daniel.kruegler at googlemail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |daniel.kruegler@googlemail.
                   |                            |com

--- Comment #2 from Daniel Krügler <daniel.kruegler at googlemail dot com> ---
The problem still exists in gcc trunk version 4.10.0 20140707 (experimental)
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Subject: [Bug c++/60967] ICE with range for in template function with C++11 and cilkplus
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id`967

--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
I'm adding the testcase and closing the bug.

[Bug libstdc++/61791] [C++11] [constexpr] Additional overloads of std::real should be a constexpr function

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61791

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-04-09
     Ever confirmed|0                           |1