ultra::scored_individual< I, F > Struct Template Reference

#include <scored_individual.h>

Public Member Functions
	scored_individual (I, F)
bool	empty () const noexcept
bool	load (std::istream &, const problem &)
bool	save (std::ostream &) const

Public Attributes
I	ind {}
F	fit {lowest<F>()}

Detailed Description

template<Individual I, Fitness F>
struct ultra::scored_individual< I, F >

Associates an individual with its fitness value.

Template Parameters

I	type modelling an individual
F	type modelling a fitness value

scored_individual is a lightweight value type used to represent the result of evaluating an individual. It is primarily intended for ranking, selection, and replacement operations in evolutionary algorithms.

The class supports ordering by fitness (via operator<=>) but deliberately does not define equality. Fitness values are typically floating-point and exact equality comparisons would be semantically misleading.

Note

Since equality is not defined, scored_individual does not model a totally ordered type and cannot be used with default std::ranges::less. Algorithms that require ordering should provide an explicit comparator or projection (e.g. comparing the fit member).

Constructor & Destructor Documentation

scored_individual()

template<Individual I, Fitness F>

scored_individual::scored_individual	(	I	i,
		F	f )

Builds a new individual/fitness pair.

Parameters

[in]	i	an individual (can be empty)
[in]	f	a fitness

Member Function Documentation

empty()

template<Individual I, Fitness F>

bool scored_individual::empty ( ) const

nodiscardnoexcept

Returns

true if the ind component is empty

load()

template<Individual I, Fitness F>

bool scored_individual::load ( std::istream & in, const problem & p )

nodiscard

Loads the object from a stream.

Parameters

[in]	in	input stream
[in]	p	active problem

Returns

true if the object loaded correctly

Note

If the load operation isn't successful the current object isn't changed.

save()

template<Individual I, Fitness F>

bool scored_individual::save ( std::ostream & out ) const

nodiscard

Saves the object into a stream.

Parameters

[out]

out

output stream

Returns

true if the object was saved correctly

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

• evolution_callbacks.h
• scored_individual.h
• scored_individual.tcc