Declare a type Foo, and create a new map with Foo as key type.Mention the conditions on Foo required to make it a possible map key type.
type Foo struct { name string x, y int } m := make(map[Foo]string)
class Foo{}; Map<Foo, int> m = {};
local map={[Foo]=true}
use Object::Pad;
class Foo { has $x :param = 0; } my $p = Foo->new(x => 5); my %map; $map{$p} = 'some data';
package Foo { sub new { my $class = shift; return bless { @_ }, $class } }; my $p = Foo->new(x => 5); my %map; $map{$p} = 'some data';
class Foo: def __init__(self, x, y): self.x = x self.y = y def __hash__(self): return hash((Foo, self.x, self.y)) def __eq__(self, other): return (self.x, self.y) == (other.x, other.y) foo = Foo(1, 2) m = {foo: 'hello'}
Foo = Struct.new(:x, :y) m = {Foo.new(42, 5) => "Hello"}
No security, no password. Other people might choose the same nickname.