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++.