finding redeclaration


I am including several include directories in my visual studio project. However, when compiling I run into:
error C2995: 'void myfunction(T &)' : function template has already been defined
see declaration of 'myfunction'

In Visual studio, what is the easiest way to find the duplicate declarations? These are third party include dirs, so not code that i am familiar with. Also, is there a way to fix this in the file it is complaining in and move on? But in a way that should someone else want to include this third party file in their project, it does not break because of changes we make in it.

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Ess KayEntrapenuerCommented:
Do a Control+F
on entire solution for


(This is the first declaration)
To find declaration used, find an instance of the 'myfunction'
Hit F12, or right click and select Go To Declaration

Note the file, and line where it is declared.

--This is how you find the other (duplicate ) declarations
Hit Shift+F12  to show all references to that function
Show Ref

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In every header file, be sure to include guards around them.
For example, if your header file is named myheaderfile.hpp, then it should look like:

// all you header stuff including templates


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If a third party header file does not include a guard, then this may work:

#include "theirheaderfile.hpp"


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Then you include myheaderfile.hpp into your code rather than theirheaderfile.hpp. But if the basic problem is due to a hierarchy of their header files, then a careful dependency analysis of their header files calling their other header files may be required, so that you know the exact ordering in which you must include your header files.

Once you determine the proper ordering, then you can create your own header file that includes all their header files in the right order, and then you might be able to just include your new ordered header file. If this latter approach works, then the problem was due to poor design of the third party header files.
Subrat (C++ windows/Linux)Software EngineerCommented:
You can also use
#pragma once
in Visual studio.
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