bsl::operator<=>

Perform a three‐way comparison of the operands.

Synopsis

Declared in <bslstl_optional.h>

template<class t_TYPE>
constexpr
std::strong_ordering
operator<=>(
    bsl::optional<t_TYPE> const& value,
    bsl::nullopt_t nullopt) noexcept;

Description

Perform a three‐way comparison of the specified value and nullopt; return the result of that comparison. This function can be called in constant expressions only if t_TYPE is not allocator‐aware.

Return Value

result of the three‐way comparison

Parameters

Name

Description

value

value compared with or used to initialize the optional

nullopt

disengaged‐optional tag; value is unused

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