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package org.checkerframework.checker.signedness.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.ImplicitFor;
import org.checkerframework.framework.qual.SubtypeOf;
import org.checkerframework.framework.qual.TypeKind;

/**
 * The value is to be interpreted as signed. That is, if the most significant bit in the bitwise
 * representation is set, then the bits should be interpreted as a negative number.
 *
 * @checker_framework.manual #signedness-checker Signedness Checker
 */
@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE_USE, ElementType.TYPE_PARAMETER})
@SubtypeOf({UnknownSignedness.class})
@ImplicitFor(
        types = {
            TypeKind.BYTE,
            TypeKind.INT,
            TypeKind.LONG,
            TypeKind.SHORT,
            TypeKind.FLOAT,
            TypeKind.DOUBLE,
            TypeKind.CHAR
        }

        // This is commented out until implicitly signed boxed types are implemented
        // correctly.

        /*,
        typeNames = {
            java.lang.Byte.class,
            java.lang.Short.class,
            java.lang.Integer.class,
            java.lang.Long.class
        }*/ )
public @interface Signed {}