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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.SubtypeOf;
/**
* The annotated expression evaluates to an integer greater than or equal to 1.
*
* As an example of a use-case for this type, consider the following code:
*
*
{@code
* if (arr.length > 0) {
* int j = arr[arr.length - 1];
* }
* }
*
* Without the knowing that {@code arr.length} is positive, the Index Checker cannot verify that
* accessing the last element of the array is safe - there might not be a last element!
*
* @checker_framework.manual #index-checker Index Checker
*/
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
@SubtypeOf({NonNegative.class})
public @interface Positive {}