Mixed crossovers#
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namespace crossover
Crossover operators used in the GAs.
class Mixed#
#include <crossover/mixed.hpp>
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template<typename ...Ts>
class Mixed : public gapp::crossover::Crossover<MixedGene<Ts::GeneType...>># The mixed crossover template that is used as the crossover operator in the MixedGene GAs.
The mixed crossover consists of a separate component crossover for each of the gene types in the mixed gene. These component crossovers are applied separately to the appropriate chromosomes of the mixed gene candidates in order to create the child candidates.
The component crossovers are independent of each other, and each of them must be a valid crossover operator that could be used for the given gene type.
- Template Parameters:
Ts – The types of the component crossovers. Must consist of crossovers for unique gene types. None of the crossover types should be a crossover for some MixedGene<> type.
Public Functions
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explicit constexpr Mixed() = default#
Create a mixed crossover operator by default constructing all of the component crossovers.
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explicit constexpr Mixed(Ts... crossovers)#
Create a mixed crossover operator from the specified component crossovers. The order of the component crossovers must match the order of the gene types in the mixed gene type that the mixed crossover operator is going to be used for.
- Parameters:
crossovers – The component crossovers that will comprise the mixed crossover.
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constexpr void crossover_rates(Probability pc) noexcept override#
Set the crossover probability used for each of the component crossovers to the same value.
- Parameters:
pc – The crossover probability. Must be in the closed interval [0.0, 1.0].
- constexpr void crossover_rates(
- const std::array<Probability, N> &pcs
Set the crossover probability used for each of the component crossovers individually. The order of the probabilities should match the order of the component crossovers.
- Parameters:
pcs – The crossover probabilities. They must all be in the closed interval [0.0, 1.0].
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constexpr std::array<Probability, N> crossover_rates() const noexcept#
- Returns:
The crossover rates set for the component crossovers. The order of the probabilities in the returned array will match the order of the component crossovers.
Public Static Attributes
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static constexpr size_t N = Base::N#
The number of component crossovers the mixed crossover is composed of.
class Crossover<MixedGene>#
#include <crossover/crossover_base.hpp>
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template<typename ...Ts>
class Crossover<MixedGene<Ts...>># The base class used for the mixed crossover operators. This is effectively the same as the primary template without the crossover probability.
- Template Parameters:
Ts – The component gene types of the mixed gene type the crossover operator is defined for.
Public Types
Public Functions
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template<typename GeneType>
constexpr void crossover_rate( - Probability pc
Set the crossover probability of the component crossover associated with the specified GeneType.
- Template Parameters:
GeneType – The gene type of the component crossover to set the probability of.
- Parameters:
pc – The crossover probability. Must be in the closed interval [0.0, 1.0].
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virtual constexpr void crossover_rates(Probability pc) noexcept = 0#
Set the crossover probability used for each of the component crossovers to the same value.
- Parameters:
pc – The crossover probability. Must be in the closed interval [0.0, 1.0].
- virtual constexpr void crossover_rates(
- const std::array<Probability, N> &pcs
Set the crossover probability used for each of the component crossovers individually. The order of the probabilities should match the order of the component crossovers.
- Parameters:
pcs – The crossover probabilities. They must all be in the closed interval [0.0, 1.0].
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template<typename GeneType>
constexpr Probability crossover_rate( - Template Parameters:
GeneType – The gene type of the component crossover to get the probability of.
- Returns:
The crossover probability of the component crossover associated with the specified GeneType.
- virtual constexpr std::array<Probability, N> crossover_rates(
- Returns:
The crossover rates set for the component crossovers. The order of the probabilities in the returned array will match the order of the component crossovers.
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template<typename GeneType>
constexpr bool allow_variable_chrom_length( This method specifies whether the crossover operator supports variable chromosome lengths for the specified gene type or not. If variable chromosome lengths are supported, the Candidates passed to the crossover operator are allowed to have chromosome lengths different from each other, and from the chromosome length specified for the GA the operator is used in. Otherwise the chromosome length of the given gene type must be the same for every Candidate.
- Template Parameters:
GeneType – The gene type of the chromosome to check.
- Returns:
True if the crossover operator supports variable chromosome lengths for the specified gene type.
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template<typename GeneType>
Crossover<GeneType> &component() & noexcept# - Template Parameters:
GeneType – The gene type of the component crossover to get.
- Returns:
The component crossover associated with the specified gene type.
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template<typename GeneType>
const Crossover<GeneType> &component( - Template Parameters:
GeneType – The gene type of the component crossover to get.
- Returns:
The component crossover associated with the specified gene type.
- CandidatePair<GeneType> operator()( ) const#
Perform the crossover operation on 2 candidate solutions. This function is implemented by crossover().
- Parameters:
ga – The genetic algorithm the crossover operator is being used in.
parent1 – The first parent solution.
parent2 – The second parent solution.
- Returns:
The pair of children resulting from the crossover.
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virtual ~Crossover() = default#
Destructor.