Constraint

The kind of lifted constraints

This module defines types and simple operations over constraints, as used in the type-checker and constraint solver.

ConstraintKinds made type classes into types of a new kind, Constraint.

Eq :: * -> Constraint
Ord :: * -> Constraint
Monad :: (* -> *) -> Constraint

The need for this extension was first publicized in the paper Scrap your boilerplate with class: extensible generic functions by Ralf Lämmel and Simon Peyton Jones in 2005, which shoehorned all the things they needed into a custom Sat typeclass. With ConstraintKinds we can put into code a lot of tools for manipulating these new types without such awkward workarounds.

Valid for: E; Default: True; Parsing Default: True; Notes: Dot only

Constraints for indexed datatypes. This module contains code that helps to specify that all elements of an indexed structure must satisfy a particular constraint.

The kind of constraints, like Show a

GtkConstraint describes a constraint between attributes of two widgets, expressed as a linear equation. The typical equation for a constraint is:

target.target_attr = source.source_attr × multiplier + constant

Each GtkConstraint is part of a system that will be solved by a ConstraintLayout in order to allocate and position each child widget or guide. The source and target, as well as their attributes, of a GtkConstraint instance are immutable after creation.

Memory-managed wrapper type.

Values that we can turn into a constraint

A constraint is an edge in the graph.

This module provides proof object definitions of constraint key. Difference between this module and Database.Record.KeyConstraint is typed constraint key column definition is included in this module.

An implementation of the Semantic Versioning Constraints. In absence of a standard around constraints, the behavior of node-semver is closely followed. The behavior is outlined here: https://github.com/npm/node-semver#ranges

Represents a constraint in the given column schema syntax

Describes a constraint between attributes of two widgets, expressed as a linear equation. The typical equation for a constraint is:

target.target_attr = source.source_attr × multiplier + constant

Each GtkConstraint is part of a system that will be solved by a ConstraintLayout in order to allocate and position each child widget or guide. The source and target, as well as their attributes, of a GtkConstraint instance are immutable after creation.