seqan3::arithmetic_range_validator< option_value_t > Class Template Reference

A validator that checks whether a number is inside a given range. More...

#include <seqan3/argument_parser/validators.hpp>

Inheritance diagram for seqan3::arithmetic_range_validator< option_value_t >:

Public Types
using	option_value_type = option_value_t
	The type of value that this validator invoked upon.

Public Member Functions
	arithmetic_range_validator (option_value_type const min_, option_value_type const max_)
	The constructor.
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 [min, max].
template<std::ranges::forward_range range_type> requires arithmetic<std::ranges::range_value_t<range_type>>
void	operator() (range_type const &range) const
	Tests whether every element in range lies inside [min, max].

Private Attributes
option_value_type	max {}
	Maximum of the range to test.
option_value_type	min {}
	Minimum of the range to test.

Additional Inherited Members
Related Symbols 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<arithmetic option_value_t>
class seqan3::arithmetic_range_validator< option_value_t >

A validator that checks whether a number is inside a given range.

Template Parameters

option_value_t

The value type of the range; must model seqan3::arithmetic .

On construction, the validator must receive a maximum and a minimum number. The class than acts as a functor, that throws a seqan3::validation_error exception whenever a given value does not lie inside the given min/max range.

// SPDX-FileCopyrightText: 2006-2025 Knut Reinert & Freie Universität Berlin
// SPDX-FileCopyrightText: 2016-2025 Knut Reinert & MPI für molekulare Genetik
// SPDX-License-Identifier: CC0-1.0
 
#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::arithmetic_range_validator my_validator{2, 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 in range [2,10] (e.g. "./test_app -i 15")
    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

arithmetic_range_validator() [no-api]

template<arithmetic option_value_t>

seqan3::arithmetic_range_validator< option_value_t >::arithmetic_range_validator ( option_value_type const  min_, option_value_type const  max_  )

no-apiinline

The constructor.

Parameters

[in]	min_	Minimum set for the range to test.
[in]	max_	Maximum set for the range to test.

Member Function Documentation

get_help_page_message() [no-api]

template<arithmetic option_value_t>

std::string seqan3::arithmetic_range_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<arithmetic option_value_t>

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

no-apiinline

Tests whether cmp lies inside [min, max].

Parameters

cmp	The input value to check.

Exceptions

seqan3::validation_error

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

template<arithmetic option_value_t>

template<std::ranges::forward_range range_type>
requires arithmetic<std::ranges::range_value_t<range_type>>

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

no-apiinline

Tests whether every element in range lies inside [min, max].

Template Parameters

range_type

The type of range to check; must model std::ranges::forward_range. The value type must model seqan3::arithmetic.

Parameters

range

The input range to iterate over and check every element.

Exceptions

seqan3::validation_error

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

• validators.hpp