How to call a function from args in a vector?

Asked Dec 01 '19 at 20:10

Active Dec 01 '19 at 20:10

Viewed 35 times

I want to call a function taking 2 parameters but I want to call this function without actually writing f(arg1, arg2). For example I have a function:

float f(float a, float b) {
    // ...
}

And I want to call it with but from a vector:

std::vector args = {1.f, 1.f}; // arguments stored in vector
f(args[0], args[1]); // call the function

In this example it works but in fact I don't know how many args there are so I want to do something like:

std::vector args = {...};
f(args...); // pass all elements as arguments

asked Dec 01 '19 at 20:10

Jojolatino

3

What's wrong with simply taking an `const std::vector &` as parameter? – Lukas-T Dec 01 '19 at 20:12
3

Or taking a (half-open) range like a lot of the standard function do. – Richard Critten Dec 01 '19 at 20:19
@churill Yes it would be the solution but I also need to std::bind my function – Jojolatino Dec 01 '19 at 20:27
@Jojolatino And where is the problem with this? – Lukas-T Dec 01 '19 at 20:36
@churill If the function takes a std::vector, how can I bind the second parameter (for example) in the vector? – Jojolatino Dec 01 '19 at 20:41
@Jojolatino Not sure what you mean. When using a vector there is not second parameter. Only a vector with two (or more) elements. – Lukas-T Dec 01 '19 at 20:46

How to call a function from args in a vector?

0 Answers0