BS PD ISO/IEC TS 19568:2017 describes extensions to the C++ Standard Library (1.2). These extensions are classes andfunctions that are likely to be used widely within a program and/or on the interface boundaries between libraries writtenby different organizations.This technical specification is non-normative. Some of the library components in this technical specification may beconsidered for standardization in a future version of C++, but they are not currently part of any C++ standard. Some ofthe components in this technical specification may never be standardized, and others may be standardized in asubstantially changed form.The goal of this technical specification is to build more widespread existing practice for an expanded C++ standardlibrary. It gives advice on extensions to those vendors who wish to provide them.Cross References:ISO/IEC 14882:2014