Create a disengaged Optional_Base using allocator.
Synopsis
Declared in <bslstl_optional.h>
Optional_Base(
std::allocator_arg_t allocatorArg,
AllocType allocator,
bsl::nullopt_t nullopt);
Parameters
Name |
Description |
allocatorArg |
tag selecting the allocator‐extended constructor |
allocator |
allocator used to supply memory |
nullopt |
disengaged‐optional tag; value is unused |
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