Question

Basically, I want to call a static function in my class which adds an entry to a static member of type std::map.

class Foo
{
    private:
        static std::map<std::string, int, StringCompare> mymap;
    public:
        static bool addEntry(std::string id);
};

std::map<std::string, int, StringCompare> Foo::mymap;

static bool Foo::addEntry(std::string id)
{
    int a = 0;
    return (mymap.insert ( std::pair<std::string, int> (id, a))).second;
}

EDIT: Forgot to ask the question D:

When I compile this code, it gives me the error:

derp.hpp:24:41: error: cannot declare member function ‘static bool Foo::addEntry(std::string)’ to have static linkage [-fpermissive]

What do I do?

Answer 1

For your original “question”, use this:

Foo::addEntry("myId");

For your forgotten question, simply remove the static keyword.