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+<?php
+
+/**
+ * This file is part of the ramsey/collection library
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
+ * @license http://opensource.org/licenses/MIT MIT
+ */
+
+declare(strict_types=1);
+
+namespace Ramsey\Collection\Map;
+
+use Ramsey\Collection\Tool\TypeTrait;
+
+/**
+ * A `TypedMap` represents a map of elements where key and value are typed.
+ *
+ * Each element is identified by a key with defined type and a value of defined
+ * type. The keys of the map must be unique. The values on the map can be=
+ * repeated but each with its own different key.
+ *
+ * The most common case is to use a string type key, but it's not limited to
+ * this type of keys.
+ *
+ * This is a direct implementation of `TypedMapInterface`, provided for the sake
+ * of convenience.
+ *
+ * Example usage:
+ *
+ * ```php
+ * $map = new TypedMap('string', Foo::class);
+ * $map['x'] = new Foo();
+ * foreach ($map as $key => $value) {
+ *     // do something with $key, it will be a Foo::class
+ * }
+ *
+ * // this will throw an exception since key must be string
+ * $map[10] = new Foo();
+ *
+ * // this will throw an exception since value must be a Foo
+ * $map['bar'] = 'bar';
+ *
+ * // initialize map with contents
+ * $map = new TypedMap('string', Foo::class, [
+ *     new Foo(), new Foo(), new Foo()
+ * ]);
+ * ```
+ *
+ * It is preferable to subclass `AbstractTypedMap` to create your own typed map
+ * implementation:
+ *
+ * ```php
+ * class FooTypedMap extends AbstractTypedMap
+ * {
+ *     public function getKeyType()
+ *     {
+ *         return 'int';
+ *     }
+ *
+ *     public function getValueType()
+ *     {
+ *          return Foo::class;
+ *     }
+ * }
+ * ```
+ *
+ * … but you also may use the `TypedMap` class:
+ *
+ * ```php
+ * class FooTypedMap extends TypedMap
+ * {
+ *     public function __constructor(array $data = [])
+ *     {
+ *         parent::__construct('int', Foo::class, $data);
+ *     }
+ * }
+ * ```
+ *
+ * @template K
+ * @template T
+ * @template-extends AbstractTypedMap<K, T>
+ */
+class TypedMap extends AbstractTypedMap
+{
+    use TypeTrait;
+
+    /**
+     * The data type of keys stored in this collection.
+     *
+     * A map key's type is immutable once it is set. For this reason, this
+     * property is set private.
+     *
+     * @var string data type of the map key.
+     */
+    private $keyType;
+
+    /**
+     * The data type of values stored in this collection.
+     *
+     * A map value's type is immutable once it is set. For this reason, this
+     * property is set private.
+     *
+     * @var string data type of the map value.
+     */
+    private $valueType;
+
+    /**
+     * Constructs a map object of the specified key and value types,
+     * optionally with the specified data.
+     *
+     * @param string $keyType The data type of the map's keys.
+     * @param string $valueType The data type of the map's values.
+     * @param array<K, T> $data The initial data to set for this map.
+     */
+    public function __construct(string $keyType, string $valueType, array $data = [])
+    {
+        $this->keyType = $keyType;
+        $this->valueType = $valueType;
+
+        /** @psalm-suppress MixedArgumentTypeCoercion */
+        parent::__construct($data);
+    }
+
+    public function getKeyType(): string
+    {
+        return $this->keyType;
+    }
+
+    public function getValueType(): string
+    {
+        return $this->valueType;
+    }
+}