Joey van Gangelen Joey van Gangelen - 1 year ago 151
C++ Question

Code errors at no operator overload

I've got a class using an std::vector> to indicate the item and its count (there can be multiple inventoryitems containing the same item).

I then proceeded to overload the clsInventoryItem its == operator.
The setup ends up being:
clsInventory.cpp -> including: clsInventory.h
clsInventory.h -> including: clsInventoryItem.h
clsInventoryItem.h -> including: stdafx.h (which in turns includes the rest of the project, excluding those 2 header files)

The clsInventoryItem contains the following in its header file:

class clsInventoryItem
{
public:
clsInventoryItem( clsItem* Item, char Quality );
clsItem* GetItem( );
char GetQuality( );

inline bool operator==( const clsInventoryItem& other )
{ /* do actual comparison */
if (m_Item == other.m_Item
&& m_Quality == other.m_Quality)
{
return true;
}
return false;
}
private:
clsItem* m_Item;
char m_Quality;
};


And it still gives an error that the equals function isn't overloaded ("Severity Code Description Project File Line Suppression State
Error C2678 binary '==': no operator found which takes a left-hand operand of type 'const BrawlerEngineLib::clsInventoryItem' (or there is no acceptable conversion) BrawlerEngineLib d:\program files (x86)\microsoft visual studio\2017\community\vc\tools\msvc\14.10.25017\include\utility 290
")...
Anyone knows why this could be the case, and how to potentially solve it?

Answer Source

Your inline bool operator==(const clsInventoryItem& other) is expected to be const.
To fix that, you need to change inline bool operator==(const clsInventoryItem& other) to inline bool operator==(const clsInventoryItem& other) const.

Also, you can get rid off the keyword inline, modern compilers will ignore the keyword and older compilers use it as a hint only and decide whether or not to inline the function on their own. They are pretty good at it ;-)

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