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FFI::C::Array(3pm) User Contributed Perl Documentation FFI::C::Array(3pm)

NAME

FFI::C::Array - Array instance for FFI

VERSION

version 0.15

SYNOPSIS

 use FFI::C::ArrayDef;
 use FFI::C::StructDef;
 
 my $point_def = FFI::C::StructDef->new(
   name  => 'point_t',
   class => 'Point',
   members => [
     x => 'double',
     y => 'double',
   ],
 );
 
 my $rect_def = FFI::C::ArrayDef->new(
   name    => 'rectangle_t',
   class   => 'Rectangle',
   members => [
     $point_def, 2,
   ]
 );
 
 # create a rectangle using the def's create method
 my $square = $rect_def->create([
   { x => 1.0, y => 1.0 },
   { x => 2.0, y => 2.0 },
 ]);
 
 printf "[[%d %d][%d %d]]\n",
   $square->[0]->x, $square->[0]->y,
   $square->[1]->x, $square->[1]->y;   # [[1 1][2 2]]
 
 # move square by 1 on the x axis
 $square->[$_]->x( $square->[$_]->x + 1 ) for 0..1;
 
 printf "[[%d %d][%d %d]]\n",
   $square->[0]->x, $square->[0]->y,
   $square->[1]->x, $square->[1]->y;   # [[2 1][3 2]]
 
 # Create a rectangle using the generated class
 my $rect = Rectangle->new;
 $rect->[0]->x(1.0);
 $rect->[0]->y(1.0);
 $rect->[1]->x(2.0);
 $rect->[1]->y(3.0);

DESCRIPTION

This class represents an instance of a C an array. This class can be created using "new" on the generated class, if that was specified for the FFI::C::ArrayDef, or by using the "create" method on FFI::C::ArrayDef.

Each element of the array can be accessed using the "get" method below, or by using the object as an array reference, thanks to magical Perl ties.

CONSTRUCTOR

new

 FFI::C::ArrayDef->new( class => 'User::Array::Class', ... );
 my $instance = User::Array::Class->new;
 my $instance = User::Array::Class->new($count);

Creates a new instance of the array. If $count is specified, that will be used as the element count, overriding the count defined by the def. If the def did not specify a count then you MUST provide a count.

METHODS

get

 my $element = $instance->get($index);
 my $element = $instance->[$index];

Gets the element at the given $index.

count

 my $count = $instance->count;

Returns the number of elements in the array, if known.

tie

 my $arrayref = $instance->tie;

Returns a Perl array reference tied to the C array.

SEE ALSO

AUTHOR

Graham Ollis <plicease@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2020-2022 by Graham Ollis.

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

2023-02-06 perl v5.36.0