I have a function that takes an std::array of given size N
void func(std::array<int,3> x) {
// do something
}
int main() {
func({4,4,4}) // works
func({4}) // works as well
}
I understand why the second call works as well, my question is: is there a way to check at compile time how many arguments I've actually passed?
The background: I don't want to second call to be allowed, I want the user to pass exactly N arguments.
You can make the function more restrictive like this :
#include <type_traits>
// let sfinae disable mismatches
template<std::size_t N>
auto func(const int (&v)[N]) -> std::enable_if_t<N==3,void>
{
// do something
}
int main()
{
func({4,4,4}); // works
func({4}); // no longer compiles
}