cli::action::Custom< Fn > Struct Template Reference

Wraps a user-defined callable as a non-terminal action pipeline step. More...

#include <action.hh>

Public Types
template<class Prev>
using	after_type
template<class Prev>
using	storage_type = void

Public Member Functions
template<class T>
auto	operator() (ActionCtx< void > ctx, ActionResult< T > input) const -> ActionResult< after_type< T > >

Static Public Attributes
template<class Prev>
static constexpr bool	accepts_input

Detailed Description

template<auto Fn>
struct cli::action::Custom< Fn >

Wraps a user-defined callable as a non-terminal action pipeline step.

Fn must be invocable as:

ActionResult<U> Fn(ActionCtx<void> ctx, ActionResult<T> input);

for each input type T it supports. The returned ActionResult<U> becomes the input to the next action in the pipeline.

This is the escape hatch for conversions or transformations that do not fit the built-in conversion or validation actions. Unlike pack::callback, Custom does not terminate the pipeline and does not store a value; its storage_type is always void.

Template Parameters

Fn	A constexpr callable used to transform the current pipeline value.

Definition at line 1918 of file action.hh.

Member Typedef Documentation

after_type

template<auto Fn>

template<class Prev>

using cli::action::Custom< Fn >::after_type

Initial value:

 
typename std::invoke_result_t<decltype(Fn), ActionCtx<void>&,
                              ActionResult<Prev>>::value_type

Definition at line 1924 of file action.hh.

storage_type

template<auto Fn>

template<class Prev>

using cli::action::Custom< Fn >::storage_type = void

Definition at line 1929 of file action.hh.

Member Function Documentation

operator()()

template<auto Fn>

template<class T>

auto cli::action::Custom< Fn >::operator() ( ActionCtx< void > ctx, ActionResult< T > input ) const -> ActionResult< after_type< T > >

inline

Definition at line 1933 of file action.hh.

Member Data Documentation

accepts_input

template<auto Fn>

template<class Prev>

bool cli::action::Custom< Fn >::accepts_input

staticconstexpr

Initial value:

                                =
std::invocable<decltype(Fn), ActionCtx<void>&, ActionResult<Prev>>

Definition at line 1920 of file action.hh.

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

• include/cli/action.hh