sharg::detail::validator_chain_adaptor< validator1_type, validator2_type > Class Template Reference

A helper struct to chain validators recursively via the pipe operator. More...

#include <sharg/validators.hpp>

Inheritance diagram for sharg::detail::validator_chain_adaptor< validator1_type, validator2_type >:

Public Types
using	option_value_type
	The underlying type in both validators.

Public Member Functions
template<typename cmp_type > requires std::invocable<validator1_type, cmp_type const> && std::invocable<validator2_type, cmp_type const>
void	operator() (cmp_type const &cmp) const
	Calls the operator() of each validator on the value cmp.
std::string	get_help_page_message () const
	Returns a message that can be appended to the (positional) options help page info.
Constructors, destructor and assignment
	validator_chain_adaptor ()=delete
	Deleted.
	validator_chain_adaptor (validator_chain_adaptor const &pf)=default
	Defaulted.
validator_chain_adaptor &	operator= (validator_chain_adaptor const &pf)=default
	Defaulted.
	validator_chain_adaptor (validator_chain_adaptor &&)=default
	Defaulted.
validator_chain_adaptor &	operator= (validator_chain_adaptor &&)=default
	Defaulted.
	validator_chain_adaptor (validator1_type vali1_, validator2_type vali2_)
	Constructing from two validators.
	~validator_chain_adaptor ()=default
	The destructor.

Private Attributes
validator1_type	vali1
	The first validator in the chain.
validator2_type	vali2
	The second validator in the chain.

Detailed Description

template<validator validator1_type, validator validator2_type>
requires std::common_with<typename validator1_type::option_value_type, typename validator2_type::option_value_type>
class sharg::detail::validator_chain_adaptor< validator1_type, validator2_type >

A helper struct to chain validators recursively via the pipe operator.

Note that both validators must operate on the same option_value_type in order to avoid unexpected behaviour and ensure that the sharg::parser::add_option call is well-formed. (add_option(val, ...., validator) requires that val is of same type as validator::option_value_type).

Remarks

For a complete overview, take a look at Parser

Member Typedef Documentation

option_value_type

template<validator validator1_type, validator validator2_type>

using sharg::detail::validator_chain_adaptor< validator1_type, validator2_type >::option_value_type

Initial value:

 
        std::common_type_t<typename validator1_type::option_value_type, typename validator2_type::option_value_type>

The underlying type in both validators.

Constructor & Destructor Documentation

validator_chain_adaptor()

template<validator validator1_type, validator validator2_type>

sharg::detail::validator_chain_adaptor< validator1_type, validator2_type >::validator_chain_adaptor ( validator1_type vali1_, validator2_type vali2_ )

inline

Constructing from two validators.

Parameters

[in]	vali1_	Some validator to be chained to vali2_.
[in]	vali2_	Another validator to be chained to vali1_.

Member Function Documentation

operator()()

template<validator validator1_type, validator validator2_type>

template<typename cmp_type >
requires std::invocable<validator1_type, cmp_type const> && std::invocable<validator2_type, cmp_type const>

void sharg::detail::validator_chain_adaptor< validator1_type, validator2_type >::operator() ( cmp_type const & cmp ) const

inline

Calls the operator() of each validator on the value cmp.

Template Parameters

cmp_type

The type of value to validate; must be invokable with each of the validator members.

Parameters

[in]

cmp

The value to validate.

This function delegates to the validation of both of the chained validators by calling their operator() one after the other. The behaviour depends on the chained validators which may throw on input error.

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

• validators.hpp