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#include <iostream>
#include <array>
#include <vector>
 
void vec_on_fly(const std::vector<int> &vec)
{
    /*...*/
}
 
void arr_on_fly(const std::array<int, 4> &vec)
{
    /*...*/
}
 
int main() 
{
    vec_on_fly(std::vector<int>{1,2, 3, 4});
    vec_on_fly({1,2, 3, 4});
 
    arr_on_fly(std::array<int, 4>{1,2, 3, 4});
    arr_on_fly({1,2,3,4});
}

prog.cpp: In function 'int main()':
prog.cpp:21:25: error: invalid initialization of reference of type 'const std::array<int, 4u>&' from expression of type '<brace-enclosed initializer list>'
prog.cpp:10:6: error: in passing argument 1 of 'void arr_on_fly(const std::array<int, 4u>&)'

Standard output is empty