NAME

Function::Return - add return type for a function

SYNOPSIS

    use Function::Return;
    use Types::Standard -types;

    sub foo :Return(Int) { 123 }
    sub bar :Return(Int) { 3.14 }

    foo(); # 123
    bar(); # ERROR! Invalid type

    # multi return values
    sub baz :Return(Num, Str) { 3.14, 'message' }
    my ($pi, $msg) = baz();
    my $count = baz(); # ERROR! Required list context.

    # empty return
    sub boo :Return() { return; }
    boo();

DESCRIPTION

Function::Return allows you to specify a return type for your functions.

IMPORT OPTIONS

name

you can change `Return` to your own name:

    use Function::Return name => 'MyReturn';

    sub foo :MyReturn(Str) { }

no_check

you can switch off type check:

    use Function::Return no_check => 1;

    sub foo :Return(Int) { 3.14 }
    foo(); # NO ERROR!

INTROSPECTION

The function Function::Return::info lets you introspect return values like Function::Parameters::Info:

    use Function::Parameters;
    use Function::Return;

    fun baz() :Return(Str) { 'hello' }

    my $pinfo = Function::Parameters::info \&baz;
    my $rinfo = Function::Return::info \&baz;

    $rinfo->types; # [Str]

SUPPORT

This module supports all perl versions starting from v5.14.

NOTE

COMPARE Return::Type

It is NOT possible to specify different type constraints for scalar and list context.

Check type constraint for void context.

Function::Return::info and Function::Parameters::info can be used together.

SEE ALSO

Function::Parameters Return::Type

LICENSE

Copyright (C) Kenta, Kobayashi.

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

AUTHOR

Kenta, Kobayashi <kentafly88@gmail.com>