# Direct modeling support

[Programming models]

## Classes | |

class | Gecode::REG |

Regular expressions over integer values. More... | |

class | Gecode::Matrix< A > |

Matrix-interface for arrays. More... | |

## Modules | |

Linear expressions and relations | |

Linear float expressions and relations | |

Set expressions and relations | |

Boolean expressions | |

Posting of expressions and relations | |

Arithmetic functions | |

Transcendental functions | |

Trigonometric functions | |

Channel functions | |

Aliases for integer constraints | |

Aliases for set constraints | |

Support for cost-based optimization |