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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 Pure} is a method annotation that means both {@link SideEffectFree} and {@link
* Deterministic}. The more important of these, when performing pluggable type-checking, is usually
* {@link SideEffectFree}.
*
* For a discussion of the meaning of {@code Pure} on a constructor, see the documentation of
* {@link Deterministic}.
*
*
This annotation is inherited by subtypes, just as if it were meta-annotated with
* {@code @InheritedAnnotation}.
*
* @checker_framework.manual #type-refinement-purity Side effects, determinism, purity, and
* flow-sensitive analysis
*/
// @InheritedAnnotation cannot be written here, because "dataflow" project cannot depend on
// "framework" project.
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.METHOD, ElementType.CONSTRUCTOR})
public @interface Pure {
/** The type of purity. */
public static enum Kind {
/** The method has no visible side effects. */
SIDE_EFFECT_FREE,
/** The method returns exactly the same value when called in the same environment. */
DETERMINISTIC
}
}