visual c++ - C++ Include Confusion -


i have following issue c++ application (i'm starting out c++).

i'm sure relates includes in way, believe correctly using include guards, not sure else can do.

example:

if declare following header file function body in header file, application compiles , runs expected. if split out separate .h , .cpp files however, build fails error copied @ end of post. i'd correctly separate implementation header understand a) correct way , b) results in faster builds.

i have included screenshots configuration properties > linker > input , general > use of mfc have had changed during project build satisfy requirements (i need use "use mfc in static library").

so, how can split files out , not have build fail? thanks.

json_ops.h (all in header file)

#ifndef json_ops_h #define json_ops_h  #include "stdafx.h"  #include "../srclib/rapidjson/document.h"  namespace cdm_data_distributable {     class json_ops     {     public:          void test_json() const;     };      void json_ops::test_json() const     {         // json parsing example          const char json[] = "{ \"hello\" : \"world\" }";          rapidjson::document d;         d.parse<0>(json);     } }  #endif

json_ops.h, json_ops.cpp (separate files)

header file

#ifndef json_ops_h #define json_ops_h  #include "stdafx.h"  #include "../srclib/rapidjson/document.h"  namespace cdm_data_distributable {     class json_ops     {     public:          void test_json() const;     }; }  #endif

.cpp file

#include "json_ops.h"  namespace cdm_data_distributable {     void json_ops::test_json() const     {         // json parsing example          const char json[] = "{ \"hello\" : \"world\" }";          rapidjson::document d;         d.parse<0>(json);     } }

resulting errors

error lnk1169: 1 or more multiply defined symbols found  "void * __cdecl operator new(unsigned int)" (??2@yapaxi@z) defined in libcmtd.lib(new.obj)  "void __cdecl operator delete(void *)" (??3@yaxpax@z) defined in libcmtd.lib(dbgdel.obj)    c:\svn\cdmdatacds\application\cdmdatadistributable.ui\uafxcwd.lib(afxmem.obj)   cdmdatadistributable.ui

enter image description here

enter image description here

it looks using pre-compiled headers; need include stdafx.h in every cpp file. add #include "stdafx.h" line in cpp, before #include "json_ops.h".

if json_ops.h included elsewhere, stdafx.h won't included systematically json_ops.cpp file.


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