CODEWITHSUNDEEP
javaarraystypesspecificationsfastutil
D. Sikilai
D. Sikilai

Reputation: 497

JRE Specification on if(m==c)m=c; and its significance

I have being seeing some weird codes of late. And i could not understand significance of their use.
a if(m==c)m=c; does not make any sense until it is seen in a library such as fastutil and jhighlight. I have googled a lot on the subject but to my surprise it seems to be Java specification which is not so documented - maybe due to deprecation or such. I will be grateful if someone would elaborate.

            int comparison;
            while ( b <= c && ( ( comparison = comp.compare( b, m ) ) <= 0 ) ) {
                if ( comparison == 0 ) {
                    if ( a == m ) m = b; // moving target; DELTA to JDK !!!
                    else if ( b == m ) m = a; // moving target; DELTA to JDK !!!
                    swapper.swap( a++, b );
                }
                b++;
            }
            while ( c >= b && ( ( comparison = comp.compare( c, m ) ) >= 0 ) ) {
                if ( comparison == 0 ) {
                    if ( c == m ) m = d; // moving target; DELTA to JDK !!!
                    else if ( d == m ) m = c; // moving target; DELTA to JDK !!!
                    swapper.swap( c, d-- );
                }
                c--;
            }
            if ( b > c ) break;
            if ( b == m ) m = d; // moving target; DELTA to JDK !!!
            else if ( c == m ) m = c; // moving target; DELTA to JDK !!!
            swapper.swap( b++, c-- );
        }

Upvotes: 3

Views: 82

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