C++ Linker Error involving operator overload function
I have a List of type Node. I want to set a temporary Node equal to the Node at the front of the List, as follows:
class Node
{
public:
Node();
Node& op开发者_开发技巧erator = (const Node& n);
};
but I keep getting a Linker Error:
Linking...
main.obj : error LNK2019: unresolved external symbol "public: class Node & __thiscall Node::operator=(class Node const &)" (??4Node@@QAEAAV0@ABV0@@Z) referenced in function "void __cdecl fillScan(int,class std::list >)" (?fillScan@@YAXHV?$list@VNode@@V?$allocator@VNode@@@std@@@std@@@Z) C:\Users\Aaron McKellar\Documents\School Stuff\CS445\Test\Debug\Test.exe : fatal error LNK1120: 1 unresolved externals
Thanks in advance!
You only showed the declaration of operator=
, not the definition. Either you didn't supply a definition or the linker can't find it.
Well, I should say: The linker definitely can't find the definition for operator=
. Either that's because you forgot to supply one or because your project/Makefile is set up incorrectly.
You need to supply a definition for operator=
, of course:
Node& Node::operator=(const Node& n) {
// 'copy' semantics for Node
}
Note that the compiler generates the assignment operator by itself using memberwise copy if none is provided. Use the compiler-generated operator if sufficient.
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