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c++constructordefault-parameters

Class template constructor default arguments

I am trying to make the constructor to set default values for template types as following:

With this struct template

template<class Type1, class Type2>
struct Pair

This is my constructor:

Pair(const Type1& t1 = Type1(), const Type2& t2 = Type2()) :
first(t1), second(t2)
{}

I use calls to the default constructor of each type. Everything goes with if I call the constructor with params:

Pair<float, double> pair_fd(1, 1);

But when I make the call without params the program gives linker errors.

Is possible to achieve what i am trying? If so, what am I missunderstanding?

Thank you all.

Solution

  • Solved.

    I was trying to create the variable like

    Pair<float, double> pair_fd();

    Instead of

    Pair<float, double> pair_fd;

    Thanks @chris