[Dev-C++] Duplicate name and header problem.

[DC A <ad...@ho...>]

I've defined a function named plus outside of all namespace and when i use 
that function
in my source code and compile, compiler spews an error because plus is 
already defined in
libstdc++ and backward/function.h has a line like below:

using std::plus;

So plus is already defined in gnu c++ library. In my source file i included 
<iostream> and
<string> headers at the beginning. So i was thinking somehow 
<backward/function.h> is
getting attached to my source file. my question is: When i include 
<iostream> and
<string> header files at the beginning of my source code, where exactly in  
the source code
of libstdc++ <backward/function.h> gets included? As a newbie i'm a bit 
confused. can
anyone kindly clarify this matter? Thanks.

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