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View Compilation Error

0_0_21482132_21225.cpp: In function 'int main()':
0_0_21482132_21225.cpp:32:31: error: no matching function for call to 'std::vector<fun>::push_back(<brace-enclosed initializer list>)'
      group.push_back({ pa,pb });
                               ^
0_0_21482132_21225.cpp:32:31: note: candidates are:
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/vector:64:0,
                 from 0_0_21482132_21225.cpp:4:
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_vector.h:913:7: note: void std::vector<_Tp, _Alloc>::push_back(const value_type&) [with _Tp = fun; _Alloc = std::allocator<fun>; std::vector<_Tp, _Alloc>::value_type = fun]
       push_back(const value_type& __x)
       ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_vector.h:913:7: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'const value_type& {aka const fun&}'
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_vector.h:931:7: note: void std::vector<_Tp, _Alloc>::push_back(std::vector<_Tp, _Alloc>::value_type&&) [with _Tp = fun; _Alloc = std::allocator<fun>; std::vector<_Tp, _Alloc>::value_type = fun]
       push_back(value_type&& __x)
       ^
GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_vector.h:931:7: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'std::vector<fun>::value_type&& {aka fun&&}'


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