seqan3::arithmetic_range_validator Class 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:

Public Types
using	option_value_type = double
	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. More...
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]. More...
template<std::ranges::forward_range range_type>
void	operator() (range_type const &range) const
	Tests whether every element in range lies inside [min, max]. More...

Related Functions
(Note that these are not member functions.)
Requirements for seqan3::validator
You can expect these (meta-)functions on all types that implement seqan3::validator.
void	operator() (option_value_type const &cmp) const
	Validates the value 'cmp' and throws a seqan3::validation_failed on failure. More...

Detailed Description

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

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

#include <seqan3/argument_parser/all.hpp>
#include <seqan3/core/debug_stream.hpp>
 
int main(int argc, const char ** 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::DEFAULT, 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::parser_invalid_argument 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;
}

Constructor & Destructor Documentation

arithmetic_range_validator()

seqan3::arithmetic_range_validator::arithmetic_range_validator ( option_value_type const  min_, option_value_type const  max_  )

inline

The constructor.

Parameters

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

Member Function Documentation

operator()() [1/2]

void seqan3::arithmetic_range_validator::operator() ( option_value_type const &  cmp ) const

inline

Tests whether cmp lies inside [min, max].

Parameters

cmp	The input value to check.

Exceptions

parser_invalid_argument

operator()() [2/2]

template<std::ranges::forward_range range_type>

void seqan3::arithmetic_range_validator::operator() ( range_type const &  range ) const

inline

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

parser_invalid_argument

Friends And Related Function Documentation

operator()()

void operator() ( option_value_type const &  cmp ) const

related

Validates the value 'cmp' and throws a seqan3::validation_failed on failure.

Template Parameters

option_value_type

The type of the value to be validated.

Parameters

[in,out]

cmp

The value to be validated.

Exceptions

seqan3::validation_failed

if value 'cmp' does not pass validation.

Attention

This is a concept requirement, not an actual function (however types satisfying this concept will provide an implementation).

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

• seqan3/argument_parser/validators.hpp