package org.checkerframework.common.aliasing.qual;
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.checkerframework.framework.qual.SubtypeOf;
/**
* An expression with this type has no aliases. In other words, no other expression, evaluated at
* the same program point, would evaluate to the exact same object value.
*
* <p>A constructor's return type should be annotated with {@code @Unique} if the constructor does
* not leak references to the constructed object. For example, the {@code String()} constructor
* return type is annotated as {@code @Unique}.
*
* @see MaybeAliased
* @checker_framework.manual #aliasing-checker Aliasing Checker
*/
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
@SubtypeOf({MaybeAliased.class})
public @interface Unique {}