CODEWITHSUNDEEP
c++staticinitialization
Agaz Wani
Agaz Wani

Reputation: 5684

Initialize static variable objects to the same value

I want to initialize all static variable objects to the same value. I have a class defined in prog1.h 

  namespace fal {
    class read_f{
    public:
        static std::string ref_content, seq_content;
        int read_fasta(int argc, char **argv);
    };
}

And I tried to initialize them in prog1.cpp

std::string fal::read_f::ref_content = seq_content = "";

But I get undefined reference error.

When I try 

std::string fal::read_f::ref_content = "" ;
std::string fal::read_f::seq_content = "";

it works fine.

How can I initialize in one line?

Upvotes: 1

Views: 77

Answers (1)

Yola
Yola

Reputation: 19019

You inline them with a comma. If you do not want to repeat the fal:: qualifier, you can use a using declaration:

using fal::read_f;
std::string read_f::ref_content = "", read_f::seq_content = "";

Additionally, since C++17 you can make those two variables inline, so that they may be defined in the class definition ([class.static.data]).

Upvotes: 3

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