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package SPVM::Stringable;
1;
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=head1 Name
SPVM::Stringable - A Interface Type to Stringify a Object
=head1 Usage
   
  class Point {
    interface Stringable;
   
C<method to_string : string ();>
      my $x = $sel->x;
      my $y = $sel->y;
       
      my $string = "($x,$y)";
       
      return $string;
    };
  }
=head1 Description
L<Stringable|SPVM::Stringable> is an interface type to stringify an object.
=head1 Interface Methods
Interface methods.
=head2 to_string
C<required method to_string : string ();>
The implementation must return the string expression.
=head1 Copyright & License
Copyright (c) 2023 Yuki Kimoto
MIT License