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Workaround for C++11 Attributes (Clang-enhanced C++ Compilers)

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Clang-enhanced C++ compilers do not support the C++11 attributes deprecated, final (C++), and noreturn, which previous-generation C++ compilers (BCC32 and BCCOSX) do support.

This topic explains how to work around the missing deprecated and final (C++) attributes when using Clang-enhanced C++ compilers. There is no workaround for the noreturn attribute.

Workaround for the deprecated attribute

You can use #pragma obsolete as a workaround for the deprecated attribute. The following is a short example of code for a deprecated function.

In previous-generation C++ compilers:

int f(int a)[[deprecated]]{
    //code here
}

In Clang-enhanced C++ compilers:

int f(int a){
    #pragma obsolete f
    //code here
}

Workaround for the final attribute

In Clang-enhanced C++ compilers, the final keyword is introduced, providing the same functionality as the C++11 final (C++) attribute.

The following is a short example of using the final keyword.

In previous-generation C++ compilers:

class A {
    virtual int f()[[final]];
};

class B : public A {
    int f(); // error, 'f' is marked 'final' and cannot be overridden
};

In Clang-enhanced C++ compilers:

class A {
    virtual int f() final;
};

class B : public A {
    int f(); //error, declaration of 'f' overrides 'final' function
};

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