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package org.checkerframework.dataflow.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;

/**
 * {@code Impure} is a method annotation that means the method might have side effects and/or might
 * be nondeterministic. Conceptually, it completes the "lattice" of purity annotations by serving as
 * a top element. That is, any {@code @}{@link Pure} method can be treated as {@code @}{@link
 * SideEffectFree} or {@code @}{@link Deterministic}, and any {@code @}{@link SideEffectFree} or
 * {@code @}{@link Deterministic} method can be treated as {@code @Impure}.
 *
 * This annotation should not be written by a programmer, because leaving a method unannotated is
 * equivalent to writing this annotation.
 *
 * The purpose of this annotation is for use by tools. A tool may distinguish between unannotated
 * methods (that the tool has not yet examined) and {@code @Impure} methods (that the tool has
 * determined to be neither {@code @SideEffectFree} nor {@code @Deterministic}).
 *
 * @checker_framework.manual #type-refinement-purity Side effects, determinism, purity, and
 *     flow-sensitive analysis
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.CONSTRUCTOR})
public @interface Impure {}