hxoptional.hpp File Reference

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Classes
struct	hxnullopt_t
class	hxoptional< T >

Functions
template<typename T>
hxoptional< hxremove_cvref_t< T > >	hxmake_optional (T &&value_)
template<typename T, typename... args_t_>
hxoptional< T >	hxmake_optional (args_t_ &&... args_)
template<typename T>
hxhash_t	hxkey_hash (const hxoptional< T > &opt_)

Variables
constexpr hxnullopt_t	hxnullopt {0}

Detailed Description

An optional value type.

Implements std::optional<T>. See hxref for a std::optional<T&> equivalent.

Function Documentation

hxkey_hash()

template<typename T>

hxhash_t hxkey_hash

(

const hxoptional< T > &

opt_

)

hxkey_hash(hxoptional<T>) - Returns the hash of the contained value if engaged, otherwise 1u.

• opt : The optional to hash.

hxmake_optional() [1/2]

template<typename T, typename... args_t_>

hxoptional< T > hxmake_optional

(

args_t_ &&...

args_

)

hxmake_optional<T> - Returns an engaged hxoptional<T> constructed in place by forwarding args to the constructor of T.

• args : Arguments forwarded to the constructor of T.

hxmake_optional() [2/2]

template<typename T>

hxoptional< hxremove_cvref_t< T > > hxmake_optional

(

T &&

value_

)

hxmake_optional - Returns an engaged hxoptional<hxremove_cvref_t<T>> constructed by forwarding value.

• value_ : The value to forward into the optional.

Variable Documentation

hxnullopt

hxnullopt_t hxnullopt {0}

inlineconstexpr

hxnullopt - A sentinel value of type hxnullopt_t representing a disengaged hxoptional.

Implements std::nullopt.