| package org.checkerframework.checker.index.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.PolymorphicQualifier; |
| |
| /** |
| * A polymorphic qualifier for the Lower Bound and Upper Bound type systems. |
| * |
| * <p>Writing {@code @PolyIndex} is equivalent to writing {@link PolyUpperBound @PolyUpperBound} |
| * {@link PolyLowerBound @PolyLowerBound}, and that is how it is treated internally by the checker. |
| * Thus, if you write an {@code @PolyIndex} annotation, you might see warnings about |
| * {@code @PolyUpperBound} or {@code @PolyLowerBound}. |
| * |
| * @checker_framework.manual #index-checker Index Checker |
| * @checker_framework.manual #qualifier-polymorphism Qualifier polymorphism |
| * @see PolyUpperBound |
| * @see PolyLowerBound |
| */ |
| @Documented |
| @Retention(RetentionPolicy.RUNTIME) |
| @Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER}) |
| @PolymorphicQualifier(UpperBoundUnknown.class) |
| public @interface PolyIndex {} |