标准编号：ISO/IEC TS 19217:2015
中文名称：信息技术 程序设计语言 C++概念的扩展
英文名称：Information technology — Programming languages — C++ Extensions for concepts
发布日期：2015-11
标准范围
This Technical Specification describes extensions to the C++ Programming Language (1.2) that enable thespecification and checking of constraints on template arguments, and the ability to overload functions andspecialize class templates based on those constraints. These extensions include new syntactic forms andmodifications to existing language semantics.The International Standard, ISO/IEC 14882, provides important context and specification for this TechnicalSpecification. This document is written as a set of changes against that specification. Instructions to modifyor add paragraphs are written as explicit instructions. Modifications made directly to existing text from theInternational Standard use underlining to represent added text and strikethrough to represent deleted text.WG21 paper N4191 defines “fold expressions”, which are used to define constraint expressions resultingfrom the use of constrained-parameters that declare template parameter packs. This feature is not presentin ISO/IEC 14882:2014, but it is planned to be included in the next revision of that International Standard.The specification of that feature is included in this document.
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