CODEWITHSUNDEEP
c++templatesfunction-pointers
ryanafrish7
ryanafrish7

Reputation: 3410

Template argument deduction failed for function pointer

The compiler is failing to deduct template argument for function pointer.

template< class Function >
class foobar {
    Function f;
public:
    foobar(Function _f) : f(_f) {}

};

The function definition is

bool foo(string a, string b) {
    // SOMETHING
}

I'm getting trouble in the following line

foobar f(foo);

The compiler error

error: missing template arguments before ‘f’

Upvotes: 0

Views: 46

Answers (1)

SergeyA
SergeyA

Reputation: 62563

Currently, there is no way to deduce type of the object by templated constructor. However, maker functions can help:

template<class T>
foobar<T> make_foobar(const T& t) {
    return Foobar<T>(t);
}

...
auto f = make_foobar(foo);

Upvotes: 2

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