implements

Declares that a type implements one or more interface contracts.

Aliases: implements

Syntax: class <name> implements <interface-list> <block>

Category#

type

Related#

• class
• interface

Examples#

radix/corpus/implet/implet.fab (canonical · keyword)#

Declares that a type implements one or more interface contracts.

# =============================================================================
# implements — Declares that a type implements one or more interface contracts
# =============================================================================
#
# What this teaches:
#   • Declares that a type implements one or more interface contracts.
#   • Related keywords: class, interface
#
# Common mistakes:
#   • Declaring `class implements Implendum` without implementing all required methods — every method signature in the interface must have a body in the class.
#
# See also: class, interface
# =============================================================================

# implements — class implements a interface (interface contract)
#
# class Nomen implements Implendum { … }
#
# GRAMMAR:
#   genusDecl :← 'class' ident 'implements' ident '{' methodDecl* '}'
#
# EXPECTED OUTPUT:
#   implet.expected — Aurelia from interface plenum().

interface Nominatum {
    fn plenum() → string
}

class Civis implements Nominatum {
    var string name

    fn plenum() → string {
        # satisfies interface requirement
        return "§"(self.nomen)
    }
}

main {
    const Civis civis ← Civis { name = "Aurelia" }
    print civis.plenum()
}

Expected output:

Aurelia