--- /dev/null
+<?php
+
+/*
+ * This file is part of composer/semver.
+ *
+ * (c) Composer <https://github.com/composer>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Composer\Semver\Constraint;
+
+interface ConstraintInterface
+{
+ /**
+ * @param ConstraintInterface $provider
+ *
+ * @return bool
+ */
+ public function matches(ConstraintInterface $provider);
+
+ /**
+ * @return string
+ */
+ public function getPrettyString();
+
+ /**
+ * @return string
+ */
+ public function __toString();
+}