NAME

Devel::Cover::Truth_Table - Truth tables for coverage objects.

VERSION

version 1.42

SYNOPSIS

use Devel::Cover::Truth_Table;
# $a || $b
my $or_tt  = Devel::Cover::Truth_Table->new_primitive('or_3', 0, 1, 1);
# $c && $d
my $and_tt = Devel::Cover::Truth_Table->new_primitive('and_3', 1, 0, 1);
# merge contents of $and_tt into right column of $or_tt, to create
# $a || ($c && $d)
$or_tt->right_merge($and_tt);
# get a (sorted) textual representation
my @text = $or_tt->sort->text;
print "$_\n" foreach @text;
__END__
A B C |exp|hit
--------------
0 0 X | 0 |---
0 1 0 | 0 |---
0 1 1 | 1 |+++
1 X X | 1 |+++
--------------

DESCRIPTION

This module provides methods for creating and merging conditional primitives ("$a && $b", "$c || $d", etc.) into more complex composite expressions.

METHODS

new_primitive($op, @coverage)

Create a new truth table based on one of the built-in primitives, which are the subclasses of Devel::Cover::DB::Condition. $op is one of the following:

and_3: "and" or "&&" with three conditional paths.
or_3: "or" or "||" with three conditional paths.
or_2: "or" or "||" with two conditional paths. (i.e., when the right hand side of the expression is a constant)
xor_4: "xor" with four conditional paths.