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package org.checkerframework.common.value.qual;

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 evaluates to an integral value (byte, short, char, int, or long) in
 * the given range. The bounds are inclusive. For example, the following declaration allows the 12
 * values 0, 1, ..., 11:
 *
 * {@code @IntRange(from=0, to=11) int month;}
 *
 * If only one of the {@code to} and {@code from} fields is set, then the other will default to
 * the max/min value of the type of the variable that is annotated. (In other words, the defaults
 * {@code Long.MIN_VALUE} and {@code Long.MAX_VALUE} are used only for \code{long}; appropriate
 * values are used for other types.)
 *
 * @checker_framework.manual #constant-value-checker Constant Value Checker
 */
@SubtypeOf(UnknownVal.class)
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE_PARAMETER, ElementType.TYPE_USE})
public @interface IntRange {
    /** Smallest value in the range, inclusive. */
    long from() default Long.MIN_VALUE;
    /** Largest value in the range, inclusive. */
    long to() default Long.MAX_VALUE;
}