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#include <utility>
 
 
int main()
{
const int defaultFoo (6502);
std::pair<const int, bool> theFooBool (5, false);
 
theFooBool = std::pair<const int, bool> (defaultFoo, false);
}
 

In file included from /usr/lib/gcc/i686-pc-linux-gnu/4.5.1/../../../../include/c++/4.5.1/utility:71:0,
                 from prog.cpp:1:
/usr/lib/gcc/i686-pc-linux-gnu/4.5.1/../../../../include/c++/4.5.1/bits/stl_pair.h: In member function 'std::pair<_T1, _T2>& std::pair<_T1, _T2>::operator=(std::pair<_T1, _T2>&&) [with _T1 = const int, _T2 = bool, std::pair<_T1, _T2> = std::pair<const int, bool>]':
prog.cpp:9:59:   instantiated from here
/usr/lib/gcc/i686-pc-linux-gnu/4.5.1/../../../../include/c++/4.5.1/bits/stl_pair.h:127:2: error: assignment of read-only data-member 'std::pair<const int, bool>::first'

Standard output is empty