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tuple - reasons for a separate header

There is a tension between having fine-grained headers and having just one header (e.g. <all> was proposed). Since compilers have to process the tokens within each header and some internal data structures also grow with the declarations seen (especially when the declarations use the same name like operator<<()), there is a compile-time trade-off. The original implementation of tuple<T...> came from Boost and predated the use of variadic templates: as a result, the declaration necessary to implement something like tuple<T...> were rather large. This caused std::experimental::tuple<T...> to be put into its own header and there wasn't any proposal to change this organization.

BTW, std::tuple<...> has nothing to do with STL.

Categories : C++

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