Class template std::tuple is a fixed-size collection of heterogeneous values. It is a generalization of std::pair. If …

Constructs a new tuple. In the descriptions that follow, let i be in the range [0, sizeof...(Types)) in order, Ti be the i th type in Types, …

TTypes, class... UTypes> constexpr common_comparison_category_t</*synth-three-way-result*/<TTypes, UTypes>...> …

Creates a tuple object, deducing the target type from the types of arguments. For each Ti in Types..., the corresponding type Vi in …

5-8) Extracts the element of the tuple t whose type is T. Fails to compile unless the tuple has exactly one element of that type.

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1,2) Compares every element of the tuple lhs with the corresponding element of the tuple rhs by operator==.

Provides compile-time indexed access to the types of the elements of the tuple.

Provides access to the number of elements in a tuple as a compile-time constant expression.

Replaces the contents of the tuple with the contents of another tuple-like object. In the descriptions that follow, let i be in the range [ 0 …