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CHAPTER 3 BUILDING C++/CLI PROGRAMS
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Prepackaged libraries may or may not support the pure option. For example, as of Visual C++ 2008, ATL and MFC don t support /clr:pure. It depends on whether or not they were compiled with the /clr:pure option. You may recompile your own native libraries as pure code, provided they meet certain restrictions, such as not using Inline assembly. __declspec(align). Any construct that brings in native code. Code that generates native exports (i.e., not using __dllexport to expose functions compiled in a pure assembly to native callers). This is because the calling convention used in pure assemblies (__clrcall) is incompatible with native code. #import to use a COM library. Intrinsics, unless the intrinsics have an MSIL implementation, such as certain C runtime or CRT functions. Refer to the appendix for a table of what s available in which compilation mode. If you re a library vendor, you might decide to ship a native and a pure version of the same library. This is what Microsoft does for the CRT and Standard C++ Libraries. Updates to the C Runtime Library and the Standard C++ Library allow programs to use the pure version of these libraries. If you compile with /clr or /clr:pure, the appropriate pure version of these standard libraries will be linked in. Using a separate pure version of a library can be advantageous if there are frequent calls to a library, since it s better if program execution remains mainly in either managed code or native code, rather than switching frequently between the two.
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Mixed Mode (/clr Compiler Option)
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In mixed mode, in addition to having the managed types and the .NET Framework available, you as a programmer in the C++ language with the C++/CLI extensions may use classic C++ code and libraries if needed. In fact, you can compile nearly all classic C++ code with the /clr option. The C++ language as extended by the C++/CLI language extensions is (for all practical purposes) a superset of the classic C++, so any C++ application is automatically a C++/CLI application provided that you compile with the /clr option. Mixed mode lets you decide how much you want to transition your existing code to make use of the managed world. Your existing code will work in the managed world, and you are free to use managed constructs as needed and enjoy the benefits. Your mixed-mode assemblies are still capable of exporting native functions, importing COM libraries, using inline assembly, compiler intrinsics, and so on, which are not available in pure or safe mode. You should be aware of the limitations of mixed-mode code. Mixed-mode assemblies cannot be used with reflection (discussed in 10), because the reflection mechanism doesn t understand native types and functions. Pure mode does support reflection. Mixedmode code is also tied to a specific processor, since it may contain machine instructions for that processor; mixed-mode binaries cannot be loaded in contexts that require a platformagnostic binary.
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If you have code that was written with the managed extensions syntax, you can still compile it by using the /clr:oldSyntax option. You can link object files generated with this option with C++/CLI code or native code. You should avoid using the old syntax too heavily, though, since it is deprecated in the Visual C++ 2005 and Visual C++ 2008 releases.
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Without /clr at all, of course, you are compiling native C++ in the classic way. If you try to use any of the C++/CLI language features, you will get compiler errors.
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Although we ve said that preexisting code should compile in mixed mode just by turning on the /clr option, there are many changes to the standard libraries that first appeared in Visual C++ 2005 that will cause compilation errors and warnings. For example, the C Runtime Library was updated to support more secure versions of many functions; depending on your warning level setting, the unsafe versions of these functions may generate compiler warnings. Also, numerous changes were made to better conform with the C++ and C standards. Refer to the What s New section in the Visual C++ documentation for details on these changes and how to disable the warnings, if necessary. Library changes aside, most code written for native C++ that works in Visual C++ 2003 will work when compiled with the /clr option in Visual C++ 2005 or Visual C++ 2008.
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