http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45923
Summary: constexpr diagnostic w/ non-literal
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
AssignedTo: unassig...@gcc.gnu.org
ReportedBy: b...@gcc.gnu.org
This is pretty minor, but thought I'd point it out.
struct complex
{
#if 0
constexpr complex(double r, double i) : re(r), im(i) { }
#else
complex(double r, double i) : re(r), im(i) { }
#endif
constexpr double real() { return re; }
double imag() const { return im; }
private:
double re;
double im;
};
constexpr complex co1(0, 1); // literal object
//constant expression data initialized by a user-defined literal
constexpr double dd2 = co1.real(); // OK
with:
%$bin/H-x86_64-gcc-constexpr.20101004/bin/g++ --version
g++ (GCC) 4.6.0 20101004 (experimental)
like so:
%$bin/H-x86_64-gcc-constexpr.20101004/bin/g++ -std=c++0x -c constexpr-basic.cc
gives:
constexpr-basic.cc:9:20: error: enclosing class of ‘constexpr double
complex::real() const’ is not a literal type
YES! Except the member function signature for real() has a superfulous "const"
constexpr-basic.cc:17:27: error: the type ‘const complex’ of constexpr variable
‘co1’ is not literal
YES! Except this is more like "invalid definition of constexpr variable 'co1'
of non-literal type 'complex'
constexpr-basic.cc:20:33: error: ‘double complex::real() const’ is not a
constexpr function
NO!
Perhaps the last one should read:
constexpr-basic.cc:20:33: error: member function ‘constexpr double
complex::real()’ cannot be used in a constant expression with a non-literal
object
Or something.
