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'function' : invalid calling convention 'calling_convention' for function compiled with /clr:pure or /clr:safe
Remarks
The /clr:pure and /clr:safe compiler options are deprecated in Visual Studio 2015 and unsupported in Visual Studio 2017.
Only __clrcall calling convention is allowed with /clr:pure.
Example
The following sample generates C3641:
// C3641.cpp
// compile with: /clr:pure /c
void __cdecl f() {} // C3641