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Function Modifiers

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This section presents descriptions of the function modifiers available with the Appmethod C++ compiler.

You can use the __declspec(dllexport), and __declspec(dllimport) modifiers to modify functions.

In 32-bit programs the keyword can be applied to class, function, and variable declarations

The __declspec(dllexport) modifier makes the function exportable from Windows. The __declspec(dllimport) modifier makes a function available to a Windows program. The keywords are used in an executable (if you don't use smart callbacks) or in a DLL.

Functions declared with the __fastcall modifier have different names than their non-__fastcall counterparts. The compiler prefixes the __fastcall function name with an @. This prefix applies to both unmangled C function names and to mangled C++ function names.

Appmethod C++ modifiers:

Modifier Use with Description

const

Variables

Prevents changes to object. Note: C++ extends const to include classes and member functions.

volatile

Variables

Prevents register allocation and some optimization. Warns compiler that object might be subject to outside change during evaluation. Note: C++ extends volatile to include classes and member functions.

__cdecl

Functions

Forces C argument-passing convention. Affects linker and link-time names. This is the default.

__cdecl

Variables

Forces global identifier case-sensitivity and leading underscores in C. This is the default.

__pascal

Functions

Forces Pascal argument-passing convention. Affects linker and link-time names.

__pascal

Variables

Forces global identifier case-insensitivity with no leading underscores in C.

__import

Functions/classes

Tells the compiler which functions or classes to import.

__export

Functions/classes

Tells the compiler which functions or classes to export.

__declspec(dllimport)

Functions/classes

Tells the compiler which functions or classes to import. This is the preferred method.

__declspec(dllexport)

Functions/classes

Tells the compiler which functions or classes to export. This is the preferred method.

__fastcall

Functions

Forces register parameter passing convention. Affects the linker and link-time names.

__stdcall

Function

Forces the standard WIN32 argument-passing convention.


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