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From: "bkoz at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/46133] New: constexpr needed for C99 complex type creation from ctor with two floating point types
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D46133

           Summary: constexpr needed for C99 complex type creation from
                    ctor with two floating point types
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: bkoz@gcc.gnu.org


Small reproducer:

struct complex
{
  typedef float value_type;
  typedef __complex__ float _ComplexT;

  constexpr complex(_ComplexT __z) : _M_value(__z) { }

  constexpr complex(float __r =3D 0.0f, float __i =3D 0.0f)
  : _M_value(__r + __i * 1.0fi) { }

private:
  _ComplexT _M_value;
};

constexpr complex c1;

Gives:

%$bin/H-x86_64-gcc-constexpr.20101022/bin/g++ -c -std=3Dgnu++0x complex_wan=
na.cc
complex_wanna.cc:16:19: error: =E2=80=98(__complex__ float){0.0f, 0.0f}=E2=
=80=99 is not a
constant expression
complex_wanna.cc:16:19: error: in expansion of =E2=80=98complex(0.0f, 0.0f)=
=E2=80=99