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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}.
*
* @checker_framework.manual #type-refinement-purity Side effects, determinism, purity, and flow-sensitive analysis
*
* @author Stefan Heule
*
*/
@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
}
}
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