Eval::TypeTiny (3)

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NAME

Eval::TypeTiny - utility to evaluate a string of Perl code in a clean environment

STATUS

This module is considered part of Type-Tiny's internals. It is not covered by the Type-Tiny stability policy.

DESCRIPTION

This module is used by Type::Tiny to compile coderefs from strings of Perl code, and hashrefs of variables to close over.

Functions

This module exports one function, which works much like the similarly named function from Eval::Closure:

eval_closure(source => $source, environment => \%env, %opt)

Constants

The following constants may be exported, but are not by default.

HAS_LEXICAL_SUBS

Boolean indicating whether Eval::TypeTiny has support for lexical subs. (This feature requires Perl 5.18.)

HAS_LEXICAL_VARS

Don't worry; closing over lexical variables in the closures is always supported! However, if this constant is true, it means that Devel::LexAlias is available, which makes them slightly faster than the fallback solution which uses tied variables. (This only makes any difference when the "alias => 1" option is used.)

EVALUATION ENVIRONMENT

The evaluation is performed in the presence of strict, but the absence of warnings. (This is different to Eval::Closure which enables warnings for compiled closures.)

The feature pragma is not active in the evaluation environment, so the following will not work:

   use feature qw(say);
   use Eval::TypeTiny qw(eval_closure);
   
   my $say_all = eval_closure(
      source => 'sub { say for @_ }',
   );
   $say_all->("Hello", "World");

The feature pragma does not ``carry over'' into the stringy eval. It is of course possible to import pragmas into the evaluated string as part of the string itself:

   use Eval::TypeTiny qw(eval_closure);
   
   my $say_all = eval_closure(
      source => 'sub { use feature qw(say); say for @_ }',
   );
   $say_all->("Hello", "World");

BUGS

Please report any bugs to <rt.cpan.org/Dist/Display.html?Queue=Type-Tiny>.

SEE ALSO

Eval::Closure, Error::TypeTiny::Compilation.

AUTHOR

Toby Inkster <tobyink@cpan.org>.

COPYRIGHT AND LICENCE

This software is copyright (c) 2013-2014, 2017 by Toby Inkster.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

DISCLAIMER OF WARRANTIES