intro(3attr)                                                      intro(3attr)

NAME
       intro - C/C++ attributes

SYNOPSIS
       [[attr]]
       [[vendor::attr]]

DESCRIPTION
       Attributes modify the properties of a source construct, such as a type,
       a variable, or a function.

       The standard syntax allows specifying a vendor for non-standard
       attributes.

VERSIONS
       C and C++ dialects have provided various forms of attributes before
       standardization.

       __attribute__((attr))
              This is the GNU syntax for attributes.  It is supported by both
              GCC and Clang.

       __declspec(attr)
              This is the MSVC syntax for attributes.  It is supported by
              Clang.

STANDARDS
       C23, C++23.

HISTORY
       [[attr]]
       [[vendor::attr]]
              C23, C++11.

       [[attr]]
       [[gnu::attr]]
              gcc 10, g++ 9, clang 9, clang++ 9.

       __attribute__((attr))
              gcc, g++, clang, clang++.

       __declspec(attr)
              clang, clang++.

Linux man-pages 6.15              2025-06-28                      intro(3attr)