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#include <iostream>
 
template <int V>
void div(char(*)[V - 1] = 0)
{
    std::cout << "-1" << std::endl;
}
template <int V>
void div(char(*)[V - 2] = 0)
{
    std::cout << "-2" << std::endl;
}
template <int V>
void div(char(*)[V - 3] = 0)
{
    std::cout << "-3" << std::endl;
}
 
int main()
{
    div<3>();
}

prog.cpp: In function 'int main()':
prog.cpp:21:12: error: call of overloaded 'div()' is ambiguous
     div<3>();
            ^
prog.cpp:4:6: note: candidate: void div(char (*)[(V - 1)]) [with int V = 3]
 void div(char(*)[V - 1] = 0)
      ^
prog.cpp:9:6: note: candidate: void div(char (*)[(V - 2)]) [with int V = 3]
 void div(char(*)[V - 2] = 0)
      ^

Standard output is empty