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#include <vector>
#include <iostream>
using namespace std;
 
struct vec2i{int x;int y;};
struct t_quad{vec2i pos;vec2i size;t_quad(){}};
 
int main() {
  vector<t_quad> arr;
  arr.push_back({{0,0},{10,20}});
  cout<<arr.size();
  return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:10:32: error: no matching function for call to ‘std::vector<t_quad>::push_back(<brace-enclosed initializer list>)’
   arr.push_back({{0,0},{10,20}});
                                ^
prog.cpp:10:32: note: candidates are:
In file included from /usr/include/c++/4.8/vector:64:0,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/stl_vector.h:901:7: note: void std::vector<_Tp, _Alloc>::push_back(const value_type&) [with _Tp = t_quad; _Alloc = std::allocator<t_quad>; std::vector<_Tp, _Alloc>::value_type = t_quad]
       push_back(const value_type& __x)
       ^
/usr/include/c++/4.8/bits/stl_vector.h:901:7: note:   no known conversion for argument 1 from ‘<brace-enclosed initializer list>’ to ‘const value_type& {aka const t_quad&}’
/usr/include/c++/4.8/bits/stl_vector.h:919:7: note: void std::vector<_Tp, _Alloc>::push_back(std::vector<_Tp, _Alloc>::value_type&&) [with _Tp = t_quad; _Alloc = std::allocator<t_quad>; std::vector<_Tp, _Alloc>::value_type = t_quad]
       push_back(value_type&& __x)
       ^
/usr/include/c++/4.8/bits/stl_vector.h:919:7: note:   no known conversion for argument 1 from ‘<brace-enclosed initializer list>’ to ‘std::vector<t_quad>::value_type&& {aka t_quad&&}’

Standard output is empty