View Compilation Error

0_0_38187034_5868.cpp: In function 'int main()':
0_0_38187034_5868.cpp:45:6: error: converting to 'std::tuple<int, int, int>' from initializer list would use explicit constructor 'constexpr std::tuple< <template-parameter-1-1> >::tuple(_UElements&& ...) [with _UElements = {int&, int&, int&}; <template-parameter-2-2> = void; _Elements = {int, int, int}]'
    p = { a,b,c };
      ^