non-static data member initializers c++

Question

non-static data member initializers only available with -std=c++11 or -std=gnu++11 
[enabled by default]
     int Red = 255;
non-static data member initializers only available with -std=c++11 or -std=gnu++11
[enabled by default]
     int Green = 255;
non-static data member initializers only available with -std=c++11 or -std=gnu++11 
[enabled by default]
     int Blue = 255;

Not sure why this doesn't work.

struct color {
    int Red = 255;
    int Green = 255;
    int Blue = 255;
};

When you get answers, you're supposed to pick the one that answered your question, and you click the checkmark. I see you have not done this for any of the questions you have asked. — Almo, Oct 17 '14 at 04:22

score 5 · Accepted Answer · edited Oct 13 '14 at 23:48

5

Enable c++11 or:

struct Color
{
    int Red;
    int Green;
    int Blue;
    Color() : Red(255), Green(255), Blue(255) {}
};

edited Oct 13 '14 at 23:48

Neil Kirk

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answered Oct 13 '14 at 23:37

marsh

2,592
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AnT stands with Russia · Answer 2 · 2014-10-13T23:44:20.283

Non-static data member initializers is a feature that exists only to C++11 version of language specification. The compiler you are using does not work in C++11 mode by default. In order to switch your compiler to C++11 mode you have to specify the -std=c++11 (or -std=gnu++11) command-line option. This is what your compiler is telling you (quite unambiguously, I might add).

There's no such feature in pre-C++11 versions of the language. That's why it "doesn't work".

score 0 · Answer 3 · answered Oct 13 '14 at 23:52

0

You need to enable C++ 11 or add the -std=c++11 flag to compile because what you are trying to do is only available in C++11

answered Oct 13 '14 at 23:52

SemicolonExpected

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score 0 · Answer 4 · answered Oct 14 '14 at 00:04

Pre-C++11, you could only initialize non-static data members in the member initializer list of the constructor. In C++11, you can use brace-or-equal initializers as shown in your code. However, if your NSDM has a brace-or-equal initializer and appears in the member initializer list, the brace-or-equal initializer is ignored. Therefore, the following will work for both C++03 and C++11:

struct Color
{
    int Red;
    int Green;
    int Blue;
    Color() : Red(255), Green(255), Blue(255) {}
};

However, since you have a C++11 ready compiler, use -std=c++11 to enable it.

non-static data member initializers c++

4 Answers4