oceandrift.validation.constraints

Validation constraints

Implemented as UDAs.

“Batteries included!” This module provides a set of constraints for the most common use cases.

More...

Members

Aliases

allFactoryConstraints alias allFactoryConstraints = getSymbolsByUDA!(oceandrift.validation.constraints, constraint): Undocumented in source.
maxValue alias maxValue = lessThanOrEqualTo: Undocumented in source.
minValue alias minValue = greaterThanOrEqualTo: Undocumented in source.

Enums

isConstraint eponymoustemplate isConstraint(alias ConstraintCandidate): Determines whether a symbol qualifies as constraint

Manifest constants

negative enum negative;
notEmpty enum notEmpty;
notNegative enum notNegative;
notPositive enum notPositive;
positive enum positive;

Structs

constraint struct constraint: UDA to mark constraint definitions
exactLength struct exactLength: Value must be exactly N units long
greaterThan struct greaterThan: Value must be > N
greaterThanOrEqualTo struct greaterThanOrEqualTo: Value must be >= N
isAlpha struct isAlpha: Value must contain only letters (a … z, A … Z)
isAlphaNum struct isAlphaNum: Value must contain only alpha-numeric characters (a … z, A … Z, 0 … 9)
isDigit struct isDigit: Value must contain only digits (0 … 9)
isLower struct isLower: Value must contain only lowercase letters (A … Z)
isUnicode struct isUnicode: Valid Unicode (UTF-8, UTF-16 or UTF-32) constraint
isUpper struct isUpper: Value must contain only uppercase letters (A … Z)
lessThan struct lessThan: Value must be < N
lessThanOrEqualTo struct lessThanOrEqualTo: Value must be <= N
maxLength struct maxLength: Value must be shorter than or as long as N units
minLength struct minLength: Value must be longer than or as long as n units
not struct not(OtherConstraint)
struct not(alias otherConstraint): Inverts a constraint
notNaN struct notNaN
notNull struct notNull: Value must not be NULL
notZero struct notZero: Value must not be equal to zero

Detailed Description

Implementing your own constraints

To implement a custom constraint, create a new struct and tag it with @constraint.

Implement a member function check() that accepts a parameter of the type to validate. Utilize templates or overloads to implement checks for different types.

Implement an errorMessage member: Either a (property) function with return type string or a field string.