| 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 {} |