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Function with templates as template argument

How do I pass a function that has a template argument to another function?

template <class _T>
void inc(int &x) {
    x++;
}

template <class FUNC>
void add(int &x, FUNC f) {
    f(x);
}

int main() {
    int x = 0;
    add(x, inc);
    return 0;
}

So, I get "error: there is no corresponding function to call" add "".

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2 answers


inc

is a template, not a function. You need to go through inc<int>

:

template <class _T>
void inc(int &x) {
    x++;
}

template <class FUNC>
void add(int &x, FUNC f) {
    f(x);
}

int main() {
    int x = 0;
    add(x, inc<int>);
    return 0;
}


(Fixed a typo f

in the main function instead of adding.)

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You forgot to pass template arguments to templates:



template <class _T>
void inc(int &x) {
    x++;
}

template <class FUNC>
void add(int &x, FUNC f) {
    f(x);
}

int main() {
    int x = 0;
    add(x, inc<int>); // <-- here
    return 0;
}
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