Switch-Declare

Switch::Declare provides a fast, compile-time, lexically-scoped switch/case
construct for Perl:

    use Switch::Declare;

    my $label = switch ($status) {
        case 200          { "ok" }
        case [400 .. 499] { "client error" }
        case /^5/         { "server error" }
        default           { "other" }
    };

The `switch` keyword is installed through the core keyword-plugin and lexer
APIs (no source filter, no smartmatch, no CPAN dependencies) and is recognised
only inside the lexical scope of a `use Switch::Declare`. The construct is
parsed entirely at compile time and lowered to an ordinary conditional
expression: for a plain variable/constant scrutinee with single-expression
arms it is exactly as fast as a hand-written if/elsif chain.

Patterns may be number (==), string (eq), regex /.../, range [LO..HI], list
[a,b,c] membership, or a \&name predicate. The scrutinee is evaluated exactly
once; the first matching case wins; an optional trailing default catches the
rest. See `perldoc Switch::Declare` for full documentation, and xt/bench.pl
for benchmarks.

This distribution includes XS and requires a C compiler to build.


INSTALLATION

To install this module, run the following commands:

	perl Makefile.PL
	make
	make test
	make install

SUPPORT AND DOCUMENTATION

After installing, you can find documentation for this module with the
perldoc command.

    perldoc Switch::Declare

You can also look for information at:

    RT, CPAN's request tracker (report bugs here)
        https://rt.cpan.org/NoAuth/Bugs.html?Dist=Switch-Declare

    Search CPAN
        https://metacpan.org/release/Switch-Declare


LICENSE AND COPYRIGHT

This software is Copyright (c) 2026 by LNATION <email@lnation.org>.

This is free software, licensed under:

  The Artistic License 2.0 (GPL Compatible)