Base class for optional types. More...

#include <sbepp.hpp>

Public Member Functions
	optional_base ()=default
	Constructs null object.

constexpr	optional_base (nullopt_t) noexcept
	Constructs null object.

constexpr	optional_base (value_type val) noexcept
	Constructs object from given value.

constexpr value_type	value () const noexcept
	Returns underlying value.

constexpr value_type &	operator* () noexcept
	Returns reference to underlying value.

constexpr value_type	operator* () const noexcept
	Returns underlying value.

constexpr bool	in_range () const noexcept
	Checks if value is in `[Derived::min_value(); Derived::max_value()]` range.

constexpr value_type	value_or (T default_value) const noexcept
	Returns value if not null, `default_value` otherwise.

constexpr bool	has_value () const noexcept
	Checks if has value.

constexpr	operator bool () const noexcept
	Checks if has value.

Friends
Comparisons
The contained values are compared only if both `lhs` and `rhs` are not null. Otherwise: `lhs` is equal to `rhs` iff both are null `lhs` is less than `rhs` iff `rhs` is not null and `lhs` is null
constexpr friend bool	operator== (const optional_base &lhs, const optional_base &rhs) noexcept
	Tests if `lhs` is equal to `rhs`

constexpr friend std::strong_ordering	operator<=> (const optional_base &lhs, const optional_base &rhs) noexcept
	Available only if SBEPP_HAS_THREE_WAY_COMPARISON == 1.

constexpr friend bool	operator!= (const optional_base &lhs, const optional_base &rhs) noexcept
	Tests if `lhs` is not equal to `rhs`

constexpr friend bool	operator< (const optional_base &lhs, const optional_base &rhs) noexcept
	Tests if `lhs` is less than `rhs`

constexpr friend bool	operator<= (const optional_base &lhs, const optional_base &rhs) noexcept
	Tests if `lhs` is less than or equal to `rhs`

constexpr friend bool	operator> (const optional_base &lhs, const optional_base &rhs) noexcept
	Tests if `lhs` is greater than `rhs`

constexpr friend bool	operator>= (const optional_base &lhs, const optional_base &rhs) noexcept
	Tests if `lhs` is greater than or equal to `rhs`

Detailed Description

template<typename T, typename Derived>
class sbepp::detail::optional_base< T, Derived >

Base class for optional types.

Note: in_range() and has_value() checks are not enforced implicitly, it's up to client to apply it.

The documentation for this class was generated from the following file:

Public Types