This reference explains the C++ programming language as implemented in the Microsoft C++ compiler. The organization is based on The Annotated C++ Reference Manual by Margaret Ellis and Bjarne Stroustrup and on the ANSI/ISO C++ International Standard (ISO/IEC FDIS 14882). Microsoft-specific implementations of C++ language features are included.

Microsoft C++, C, and Assembler documentation Learn how to use C++, C, and assembly language to develop applications, services, and tools for your platforms and devices.

C++ API documentation with instant search, offline support, keyboard shortcuts, mobile version, and more.

C++ is not a product and there is no company behind it. So there is no official documentation. C++ is a Standard. You can download the C++ standard text (here), and/or documentations on implementations of the standard, which are compiler suits (gcc, icc, clang, msvc, etc.).

C++ language documentation Learn to use C++ and the C++ standard library.