[#BSLSTL_OPTIONAL_CONSTEXPR17]
= BSLSTL_OPTIONAL_CONSTEXPR17
:mrdocs:

`BSLSTL_OPTIONAL_CONSTEXPR17` controls whether constructors that are `constexpr` in C++17 `std::optional` are `constexpr` in `bsl::optional` for allocator‐unaware types.

== Synopsis

Declared in `<bslstl_optional.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
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#define BSLSTL_OPTIONAL_CONSTEXPR17

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