cpp/experimental/lib extensions/promise

''This page is about the modified version of std with type-erased allocator support provided by the Library Fundamentals TSes. For the version of provided by the concurrency TS supporting the  improvements made by that TS, see .''

(and ) is a modified version of std provided by the library fundamentals TS with support for type-erased allocators.

Helper classes
{{identical|{{small|std::}}promise|2=

Member functions
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