static_cast makes a copy
#include <iostream>
void change_one_print_other( int& a, const int& b )
{
a = 0;
std::cout << b << "\n";
}
int main(void)
{
int x = 5, y = 5;
change_one_print_other(x, x);
change_one_print_other(y, static_cast<int>(y));
}
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