I recently encountered the Ambiguous Symbol error, specifically: “error C2872: 'IMasterLoader' : ambiguous symbol” when using an interface I wrote in C# with a class built in C++.
1: namespace IMasterLoader
2: {
3: public interface IMasterLoader<T> where T : class
4: {
5: bool Load(T master, ref string strError);
6: }
7: }
Code producing the error:
1: // LmCellSectorLog.h
2: #pragma once
3: using namespace System;
4: using namespace System::Collections::Generic;
5: using namespace System::Data;
6:
7: namespace LmCellSectorLog {
8: using namespace IMasterLoader;
9: public ref class CLmCellSectorLogLoader : IMasterLoader<CLmCellSectorLogMaster^>
10: {
11: public:
12: virtual bool Load(CLmCellSectorLogMaster^ master, String^% strError);
13: };
14: }
Compiler generated error C2872: 'IMasterLoader' : ambiguous symbol:
While searching for a solution to this problem, I encountered the Compiler Error C2872 (C++) page from MSDN, which didn’t have my exact solution, but led me to think differently about the syntax.
Jumping forward to the solution:
Assuming the problem was the compiler’s “scope” and recognition of the interface, I eventually changed the reference by fully qualifying the interface name with the “scope resolution operator (::)” and that solved the problem.
At that point, it was no longer necessary to reference the interface at the namespace:
1: public ref class CLmCellSectorLogLoader : ::IMasterLoader::IMasterLoader<CLmCellSectorLogMaster^>
2: {
3: public:
4: virtual bool Load(CLmCellSectorLogMaster^ master, String^% strError);
5: };