Why can constexpr not apply to constructors?

Question

The following code cannot be compiled with VC++ 2013 CTP.

struct A
{
    constexpr A()
        : _n(5)
    {}

    int _n;
};

constexpr A f()
{
    return A();
}

int main()
{
    auto a = f();
}

error C3757: 'A': type not allowed for 'constexpr' function

I thought MSVC only supported non-member `constexpr` functions. — Simple, Feb 19 '14 at 10:59
Indeed, that wouldn't be a problem for another compiler such as GCC. — E_net4, Feb 19 '14 at 11:21

score 2 · Accepted Answer · answered Feb 19 '14 at 13:00

2

VC 2013 does not support all C++11 features yet. Look at MSDN list.

answered Feb 19 '14 at 13:00

Spock77

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My compiler is VC++ 2013 CTP, rather than VC++ 2013. – xmllmx Feb 20 '14 at 04:58
1

According to [this article](http://blogs.msdn.com/b/vcblog/archive/2013/11/18/announcing-the-visual-c-compiler-november-2013-ctp.aspx), the support of constexpr in 2013 CTP is "except for member functions". – Spock77 Feb 20 '14 at 06:58

Why can constexpr not apply to constructors?

1 Answers1