seqan3::value_list_validator< option_value_t > Class Template Reference

A validator that checks whether a value is inside a list of valid values. More...

#include <seqan3/argument_parser/validators.hpp>

Inheritance diagram for seqan3::value_list_validator< option_value_t >:

Public Types
using	option_value_type = option_value_t
	Type of values that are tested by validator.

Public Member Functions
std::string	get_help_page_message () const
	Returns a message that can be appended to the (positional) options help page info.
void	operator() (option_value_type const &cmp) const
	Tests whether cmp lies inside values.
template<std::ranges::forward_range range_type> requires std::convertible_to<std::ranges::range_value_t<range_type>, option_value_type>
void	operator() (range_type const &range) const
	Tests whether every element in range lies inside values.
Constructors, destructor and assignment
	value_list_validator ()=default
	Defaulted.
	value_list_validator (value_list_validator const &)=default
	Defaulted.
	value_list_validator (value_list_validator &&)=default
	Defaulted.
value_list_validator &	operator= (value_list_validator const &)=default
	Defaulted.
value_list_validator &	operator= (value_list_validator &&)=default
	Defaulted.
	~value_list_validator ()=default
	Defaulted.
template<std::ranges::forward_range range_type> requires std::constructible_from<option_value_type, std::ranges::range_rvalue_reference_t<range_type>>
	value_list_validator (range_type rng)
	Constructing from a range.
template<typename... option_types> requires ((std::constructible_from<option_value_type, option_types> && ...))
	value_list_validator (option_types &&... opts)
	Constructing from a parameter pack.

Related Functions
(Note that these are not member functions.)
template<typename option_type , typename... option_types>
	value_list_validator (option_type, option_types...) -> value_list_validator< std::string >
	Type deduction guides.
template<typename range_type >
	value_list_validator (range_type &&rng) -> value_list_validator< std::string >
	Deduction guide for ranges over a value type convertible to std::string.
template<typename option_type , typename... option_types>
	value_list_validator (option_type, option_types...) -> value_list_validator< option_type >
	Deduction guide for a parameter pack.
template<typename range_type >
	value_list_validator (range_type &&rng) -> value_list_validator< std::ranges::range_value_t< range_type > >
	Deduction guide for ranges.
Related Functions inherited from validator
using	option_value_type
	The type of value on which the validator is called on.
void	operator() (option_value_type const &cmp) const
	Validates the value 'cmp' and throws a seqan3::validation_error on failure.

Detailed Descriptionno-api

template<typename option_value_t>
class seqan3::value_list_validator< option_value_t >

A validator that checks whether a value is inside a list of valid values.

Template Parameters

option_value_t

Type of values that are tested by validator.

On construction, the validator must receive a range or parameter pack of valid values. The class than acts as a functor, that throws a seqan3::validation_error exception whenever a given value is not in the given list.

Note

In order to simplify the chaining of validators, the option value type is deduced to std::string if the range's value type is convertible to it. Otherwise, the option value type is deduced to the value type of the range.

#include <seqan3/argument_parser/all.hpp>
#include <seqan3/core/debug_stream.hpp>
 
int main(int argc, char const ** argv)
{
    seqan3::argument_parser myparser{"Test", argc, argv}; // initialize
 
    int myint;
    seqan3::value_list_validator my_validator{2, 4, 6, 8, 10};
 
    myparser.add_option(myint, 'i', "integer", "Give me a number.", seqan3::option_spec::standard, my_validator);
 
    // an exception will be thrown if the user specifies an integer
    // that is not one of [2,4,6,8,10] (e.g. "./test_app -i 3")
    try
    {
        myparser.parse();
    }
    catch (seqan3::argument_parser_error const & ext) // the user did something wrong
    {
        std::cerr << "[PARSER ERROR] " << ext.what() << "\n"; // customize your error message
        return -1;
    }
 
    seqan3::debug_stream << "integer given by user passed validation: " << myint << "\n";
    return 0;
}

Remarks

For a complete overview, take a look at Argument Parser

Constructor & Destructor Documentation

value_list_validator() [1/2] [no-api]

template<typename option_value_t >

template<std::ranges::forward_range range_type>
requires std::constructible_from<option_value_type, std::ranges::range_rvalue_reference_t<range_type>>

seqan3::value_list_validator< option_value_t >::value_list_validator ( range_type  rng )

no-apiinline

Constructing from a range.

Template Parameters

range_type

The type of range; must model std::ranges::forward_range and value_list_validator::option_value_type must be constructible from the rvalue reference type of the given range.

Parameters

[in]

rng

The range of valid values to test.

value_list_validator() [2/2] [no-api]

template<typename option_value_t >

template<typename... option_types>
requires ((std::constructible_from<option_value_type, option_types> && ...))

seqan3::value_list_validator< option_value_t >::value_list_validator ( option_types &&...  opts )

no-apiinline

Constructing from a parameter pack.

Template Parameters

option_types

The type of option values in the parameter pack; The value_list_validator::option_value_type must be constructible from each type in the parameter pack.

Parameters

[in]

opts

The parameter pack values.

Member Function Documentation

get_help_page_message() [no-api]

template<typename option_value_t >

std::string seqan3::value_list_validator< option_value_t >::get_help_page_message ( ) const

no-apiinline

Returns a message that can be appended to the (positional) options help page info.

Implements validator.

operator()() [1/2] [no-api]

template<typename option_value_t >

void seqan3::value_list_validator< option_value_t >::operator() ( option_value_type const &  cmp ) const

no-apiinline

Tests whether cmp lies inside values.

Parameters

cmp	The input value to check.

Exceptions

seqan3::validation_error

operator()() [2/2] [no-api]

template<typename option_value_t >

template<std::ranges::forward_range range_type>
requires std::convertible_to<std::ranges::range_value_t<range_type>, option_value_type>

void seqan3::value_list_validator< option_value_t >::operator() ( range_type const &  range ) const

no-apiinline

Tests whether every element in range lies inside values.

Template Parameters

range_type

The type of range to check; must model std::ranges::forward_range.

Parameters

range

The input range to iterate over and check every element.

Exceptions

seqan3::validation_error

Friends And Related Function Documentation

value_list_validator() [no-api]

template<typename option_type , typename... option_types>

value_list_validator ( option_type  , option_types...    ) -> value_list_validator< std::string >

no-apirelated

Type deduction guides.

Given a parameter pack of types that are convertible to std::string, delegate to value type std::string.

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

• validators.hpp