Question

I’m getting an error occurring in the ‘xutility’ class – It is locked as I did not create it

error C2582: 'operator =' function is unavailable in 'Agent'

The error points to these lines in the code:

    // TEMPLATE FUNCTION move
template<class _InIt,
class _OutIt> inline
_OutIt _Move(_InIt _First, _InIt _Last,
    _OutIt _Dest, _Nonscalar_ptr_iterator_tag)
{   // move [_First, _Last) to [_Dest, ...), arbitrary iterators
for (; _First != _Last; ++_Dest, ++_First)
    *_Dest = _STD move(*_First); // this line has the error
return (_Dest);
}

Why is this occurring? What does it mean and how can I fix it?

EDIT – this is what I grabbed from the output, can someone help me understand this? Sorry to be a complete newbie…

1>------ Build started: Project: D3D10DEMO, Configuration: Debug Win32 ------
1>  Level.cpp
1>c:\users\asher\documents\my dropbox\direct3d\d3d10demo_1.0\d3d10demo\level.cpp(449): warning     C4018: '<' : signed/unsigned mismatch
1>  Brain.cpp
1>c:\users\asher\documents\my dropbox\direct3d\d3d10demo_1.0\d3d10demo\brain.cpp(43): warning C4413: 'Brain::nodes' : reference member is initialized to a temporary that doesn't persist after the  constructor exits
1>          c:\users\asher\documents\my dropbox\direct3d\d3d10demo_1.0\d3d10demo\brain.h(34) : see declaration of 'Brain::nodes'
1>c:\users\asher\documents\my dropbox\direct3d\d3d10demo_1.0\d3d10demo\brain.cpp(43): warning C4413: 'Brain::roomNodeVectors' : reference member is initialized to a temporary that doesn't persist after the constructor exits
1>          c:\users\asher\documents\my dropbox\direct3d\d3d10demo_1.0\d3d10demo\brain.h(35) : see declaration of 'Brain::roomNodeVectors'
1>c:\program files (x86)\microsoft visual studio 10.0\vc\include\xutility(2514): error C2582: 'operator =' function is unavailable in 'Agent'
1>          c:\program files (x86)\microsoft visual studio 10.0\vc\include\xutility(2535) : see   reference to function template instantiation '_OutIt std::_Move<_InIt,_OutIt> (_InIt,_InIt,_OutIt,std::_Nonscalar_ptr_iterator_tag)' being compiled
1>          with
1>          [
1>              _OutIt=Agent *,
1>              _InIt=Agent *
1>          ]
1>          c:\program files (x86)\microsoft visual studio 10.0\vc\include\vector(1170) : see reference to function template instantiation '_OutIt std::_Move<Agent*,Agent*>(_InIt,_InIt,_OutIt)' being compiled
1>          with
1>          [
1>              _OutIt=Agent *,
1>              _InIt=Agent *
1>          ]
1>          c:\program files (x86)\microsoft visual studio 10.0\vc\include\vector(1165) : while compiling class template member function 'std::_Vector_iterator<_Myvec> std::vector<_Ty>::erase(std::_Vector_const_iterator<_Myvec>)'
1>          with
1>          [
1>              _Myvec=std::_Vector_val<Agent,std::allocator<Agent>>,
1>              _Ty=Agent
1>          ]
1>          c:\users\asher\documents\my dropbox\direct3d\d3d10demo_1.0\d3d10demo\brain.h(41) : see reference to class template instantiation 'std::vector<_Ty>' being compiled
1>          with
1>          [
1>              _Ty=Agent
1>          ]
1>c:\program files (x86)\microsoft visual studio 10.0\vc\include\xutility(2514): error C2582: 'operator =' function is unavailable in 'Pickup'
1>          c:\program files (x86)\microsoft visual studio 10.0\vc\include\xutility(2535) : see reference to function template instantiation '_OutIt std::_Move<_InIt,_OutIt>(_InIt,_InIt,_OutIt,std::_Nonscalar_ptr_iterator_tag)' being compiled
1>          with
1>          [
1>              _OutIt=Pickup *,
1>              _InIt=Pickup *
1>          ]
1>          c:\program files (x86)\microsoft visual studio 10.0\vc\include\vector(1170) : see reference to function template instantiation '_OutIt std::_Move<Pickup*,Pickup*>(_InIt,_InIt,_OutIt)' being compiled
1>          with
1>          [
1>              _OutIt=Pickup *,
1>              _InIt=Pickup *
1>          ]
1>          c:\program files (x86)\microsoft visual studio 10.0\vc\include\vector(1165) : while compiling class template member function 'std::_Vector_iterator<_Myvec> std::vector<_Ty>::erase(std::_Vector_const_iterator<_Myvec>)'
1>          with
1>          [
1>              _Myvec=std::_Vector_val<Pickup,std::allocator<Pickup>>,
1>              _Ty=Pickup
1>          ]
1>          c:\users\asher\documents\my dropbox\direct3d\d3d10demo_1.0\d3d10demo\brain.h(44) : see reference to class template instantiation 'std::vector<_Ty>' being compiled
1>          with
1>          [
1>              _Ty=Pickup
1>          ]
1>  Generating Code...
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========

Answer 1

You seem to be calling a function template of the standard library with a type Agent that cannot be move-assigned to, yet the algorithm invoked needs to do just that.

As Als said in a comment to your question, you need to show the code that invokes this algorithm.