Template::Namespace::Constants(3) User Contributed Perl Documentation Template::Namespace::Constants(3)

# [NAME](#NAME)

Template::Namespace::Constants - Compile time constant folding

# [SYNOPSIS](#SYNOPSIS)

```
    # easy way to define constants
    use Template;
    my $tt = Template->new({
        CONSTANTS => {
            pi => 3.14,
            e  => 2.718,
        },
    });
    # nitty-gritty, hands-dirty way
    use Template::Namespace::Constants;
    my $tt = Template->new({
        NAMESPACE => {
            constants => Template::Namespace::Constants->new({
                pi => 3.14,
                e  => 2.718,
            },
        },
    });
```

# [DESCRIPTION](#DESCRIPTION)

The "Template::Namespace::Constants" module implements a namespace handler which is plugged into the "Template::Directive" compiler module. This then performs compile time constant folding of variables in a particular namespace.

# [METHODS](#METHODS)

## [new(\\%constants)](#new%28)

The **new()** constructor method creates and returns a reference to a new Template::Namespace::Constants object. This creates an internal stash to store the constant variable definitions passed as arguments.

```
    my $handler = Template::Namespace::Constants->new({
        pi => 3.14,
        e  => 2.718,
    });
```

## [ident(\\@ident)](#ident%28)

Method called to resolve a variable identifier into a compiled form. In this case, the method fetches the corresponding constant value from its internal stash and returns it.

# [AUTHOR](#AUTHOR)

Andy Wardley <abw@wardley.org> <http://wardley.org/>

# [COPYRIGHT](#COPYRIGHT)

Copyright (C) 1996-2022 Andy Wardley. All Rights Reserved.

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

# [SEE ALSO](#SEE_ALSO)

Template::Directive

2026-10-26 perl v5.44.0

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Document: Template::Namespace::Constants(3pm) from perl-template-toolkit 3.106-r4 (Chainguard OS)
Source: https://github.com/abw/Template2.git