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Is there something like Java's annotations in C++ ?
For example, the @Override annotation marks a function that it overrides another function, and if it wouldn't, it would give an error at compile time.
I am looking for something like this in C++.
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Notice the @interface keyword. This signals to the Java compiler that this is a Java annotation definition. Notice that each element is defined similarly to a method definition in an interface. It has a data type and a name.
Annotation is defined like a ordinary Java interface, but with an '@' preceding the interface keyword (i.e., @interface ). You can declare methods inside an annotation definition (just like declaring abstract method inside an interface). These methods are called elements instead.
@Override @Override annotation informs the compiler that the element is meant to override an element declared in a superclass. Overriding methods will be discussed in Interfaces and Inheritance. While it is not required to use this annotation when overriding a method, it helps to prevent errors.
C++11 provides support for generalized attributes, which can be seen as superset of Java annotations, as they can be applied not just to variables/functions, but also to statements, for example. But C++11 defines only syntax for generalized attributes, not means for user to define them.
This article gives good overview of generalized attributes: http://www.codesynthesis.com/~boris/blog/2012/04/18/cxx11-generalized-attributes/
GCC supports this feature from version 4.8, according to: http://gcc.gnu.org/projects/cxx0x.html
To implement support for user-defined attributes, compiler plugins are promising, especially based on high-level language integration, like https://fedorahosted.org/gcc-python-plugin/
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