fcppt.monad

Description

Monad typeclass and related functions.

Classes
struct	fcppt::monad::instance< Type >
	Used to implement a monad instance. More...

Typedefs
template<typename Type , typename Value >
using	fcppt::monad::constructor = typename fcppt::monad::instance< Type >::template constructor< Value >::type
	Applies the constructor of a monad.
template<typename Type >
using	fcppt::monad::inner_type = typename fcppt::monad::instance< Type >::template inner_type< Type >::type
	Extracts the type a monadic constructor was used with.

Functions
template<typename Arg , typename Function >
std::invoke_result_t< Function, fcppt::move_if_rvalue_type< Arg, fcppt::monad::inner_type< std::remove_cvref_t< Arg > > > >	fcppt::monad::bind (Arg &&_arg, Function const &_function)
	Monadic bind.
template<typename Value , typename... Lambdas>
auto	fcppt::monad::chain (Value &&_value, Lambdas const &..._lambdas)
	Chains multiple bind calls.
template<typename Value , typename... Lambdas>
auto	fcppt::monad::do_ (Value &&_value, Lambdas const &..._lambdas)
	Do-notation for monads.
template<typename Type , typename Value >
fcppt::monad::constructor< Type, std::remove_cvref_t< Value > >	fcppt::monad::return_ (Value &&_value)
	Monadic return.

Typedef Documentation

constructor

template<typename Type , typename Value >

using fcppt::monad::constructor = typedef typename fcppt::monad::instance<Type>::template constructor<Value>::type

Applies the constructor of a monad.

Applies the constructor Type to Value.

For example, if Type=optional and Value=int then the result is optional<int>.

inner_type

template<typename Type >

using fcppt::monad::inner_type = typedef typename fcppt::monad::instance<Type>::template inner_type<Type>::type

Extracts the type a monadic constructor was used with.

Becaused C++ lacks type inference, we need a special function to get a from m a.

Function Documentation

bind()

template<typename Arg , typename Function >

std::invoke_result_t< Function, fcppt::move_if_rvalue_type< Arg, fcppt::monad::inner_type< std::remove_cvref_t< Arg > > > > fcppt::monad::bind ( Arg &&  _arg, Function const &  _function  )

inline

Monadic bind.

chain()

template<typename Value , typename... Lambdas>

auto fcppt::monad::chain	(	Value &&	_value,
		Lambdas const &...	_lambdas
	)

Chains multiple bind calls.

Let Lambdas = l_1, ..., l_n. Calls bind(... bind(bind(_value,_l1),l_2) ... ,l_n).

do_()

template<typename Value , typename... Lambdas>

auto fcppt::monad::do_	(	Value &&	_value,
		Lambdas const &...	_lambdas
	)

Do-notation for monads.

return_()

template<typename Type , typename Value >

fcppt::monad::constructor< Type, std::remove_cvref_t< Value > > fcppt::monad::return_

(

Value &&

_value

)

Monadic return.