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CppIfdef

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(C++) #ifdef

Preprocessor statement, meaning 'if defined'. Comparable to an if- statement. It can be used to make your header files compatible under multiple programming environments

Here is an example that makes a header file compatible under a console and a C++ Builder environment.

ifdef __STD_IOSTREAM__

void sayHello()
{
  std::cout << "Hello World" << std::endl;
}
endif


ifdef VCL_H

void sayHello()
{
  ShowMessage("Hello World");
}
endif

Topic links

• void
• std
• scope operator'::'
• cout
• stream out operator '<<'
• endl
• return
• #endif
• ShowMessage (C++ VCL)

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