C ++ / CLI: managed / unmanaged scope # pragma

I have a mixed DLL and a .cpp file in it with managed and unmanaged code. A simplified reproduction example looks like this:

#include "stdafx.h"
#pragma managed // Just for explicitness (doesn't influence results)
#include <msclr\marshal.h>

void Test()
{
    System::String^ sName = "";
    msclr::interop::marshal_context context;
    context.marshal_as<const TCHAR*>(sName);
}

//#pragma unmanaged // uncomment this line to get errors

      

        
        
        
      

    

This code compiles successfully, however if I uncomment the last line ( #pragma unmanaged

) it throws the following errors:

2>  Test.cpp
2>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\msclr\marshal.h(48): error C3280: 'msclr::interop::marshal_context::internal_marshaler<_To_Type,_From_Type,_Needs_Context>::internal_marshaler' : a member-function of a managed type cannot be compiled as an unmanaged function
2>          with
2>          [
2>              _To_Type=const wchar_t *,
2>              _From_Type=System::String ^,
2>              _Needs_Context=true
2>          ]
2>          This diagnostic occurred in the compiler generated function 'msclr::interop::marshal_context::internal_marshaler<_To_Type,_From_Type,_Needs_Context>::internal_marshaler(void)'
2>          with
2>          [
2>              _To_Type=const wchar_t *,
2>              _From_Type=System::String ^,
2>              _Needs_Context=true
2>          ]
2>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\msclr\marshal.h(48): error C3642: 'System::Object::Object(void)' : cannot call a function with __clrcall calling convention from native code
2>          This diagnostic occurred in the compiler generated function 'msclr::interop::marshal_context::internal_marshaler<_To_Type,_From_Type,_Needs_Context>::internal_marshaler(void)'
2>          with
2>          [
2>              _To_Type=const wchar_t *,
2>              _From_Type=System::String ^,
2>              _Needs_Context=true
2>          ]
2>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\msclr\marshal.h(48): error C3175: 'System::Object::Object' : cannot call a method of a managed type from unmanaged function 'msclr::interop::marshal_context::internal_marshaler<_To_Type,_From_Type,_Needs_Context>::internal_marshaler'
2>          with
2>          [
2>              _To_Type=const wchar_t *,
2>              _From_Type=System::String ^,
2>              _Needs_Context=true
2>          ]
2>          This diagnostic occurred in the compiler generated function 'msclr::interop::marshal_context::internal_marshaler<_To_Type,_From_Type,_Needs_Context>::internal_marshaler(void)'
2>          with
2>          [
2>              _To_Type=const wchar_t *,
2>              _From_Type=System::String ^,
2>              _Needs_Context=true
2>          ]
2>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\msclr\marshal.h(48): error C3821: 'msclr::interop::marshal_context::internal_marshaler<_To_Type,_From_Type,_Needs_Context>::internal_marshaler(void)': managed type or function cannot be used in an unmanaged function
2>          with
2>          [
2>              _To_Type=const wchar_t *,
2>              _From_Type=System::String ^,
2>              _Needs_Context=true
2>          ]
2>          This diagnostic occurred in the compiler generated function 'msclr::interop::marshal_context::internal_marshaler<_To_Type,_From_Type,_Needs_Context>::internal_marshaler(void)'
2>          with
2>          [
2>              _To_Type=const wchar_t *,
2>              _From_Type=System::String ^,
2>              _Needs_Context=true
2>          ]
2>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\msclr\marshal.h(282): error C3645: 'msclr::interop::marshal_context::internal_marshaler<_To_Type,_From_Type,_Needs_Context>::internal_marshaler' : __clrcall cannot be used on functions compiled to native code
2>          with
2>          [
2>              _To_Type=const wchar_t *,
2>              _From_Type=System::String ^,
2>              _Needs_Context=true
2>          ]
2>          This diagnostic occurred in the compiler generated function 'msclr::interop::marshal_context::internal_marshaler<_To_Type,_From_Type,_Needs_Context>::internal_marshaler(void)'
2>          with
2>          [
2>              _To_Type=const wchar_t *,
2>              _From_Type=System::String ^,
2>              _Needs_Context=true
2>          ]

      

        
        
        
      

    

I found that I can get rid of the error by appending #pragma managed

to the end of my .cpp file. But I still don't understand why the errors occur. This behavior #pragma unmanaged

seems completely intuitive to me. Can someone please explain?

As far as I understand:

• #pragma (un)managed
  
  affects the compilation of the code below . So if it is defined at the end of the .cpp file (nothing below), it should have no effect.
• Also http://msdn.microsoft.com/en-us/library/0adb9zxe.aspx says:

  When a template function is created, the state of the pragma at the time of definition for the template determines whether it is managed or unmanaged.

Am I wrong somewhere?