bsl::pair::pair

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.