[#bsl-pair-0b-2constructor-096]
= xref:bsl.adoc[bsl]::xref:bsl/pair-0b.adoc[pair]::pair
:relfileprefix: ../../
:mrdocs:

Create a `pair` from piece‐wise construction of `first` and `second` values by forwarding in order the elements in the specified `first_args` and `second_args` tuples to the corresponding constructor of (template parameter) types `T1` and `T2`, respectively. Optionally specify a `basicAllocator`, used to supply memory for each of `first` and `second` when its type (template parameter `T1` or `T2`, respectively) uses `bslma`‐style allocators. Allocators can also be passed as tuple members straight to `T1` or `T2` (or both) constructors using the first version (but use of the second version for this approach will result in a compile‐time error). This method requires that `T1` and `T2` be constructible from (the variable number of template parameters) `ARGS_1` and `ARGS_2` respectively.

== Synopsis

Declared in `<bslstl_pair.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<
    class... ARGS_1,
    class... ARGS_2>
pair(
    std::piecewise_construct_t,
    std::tuple<ARGS_1...> first_args,
    std::tuple<ARGS_2...> second_args);
----


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