BitVecCountOnes

Function
October 8, 2025

Table of Contents

`BitVecCountOnes`

Description

Count number of bits set to 1 in bitvector.

Parameters

Name	Direction	Description
`bv`	in	Bitvector to count ones in

Usage example (from documentation)

  u64 ones = BitVecCountOnes(&flags);

Usage example (Cross-references)

In BitVec.c:436:

    }
    
    u64 BitVecCountOnes(BitVec *bitvec) {
    ValidateBitVec(bitvec);
    if (!bitvec->data)

In BitVec.c:451:

    u64 BitVecCountZeros(BitVec *bitvec) {
    ValidateBitVec(bitvec);
    return bitvec->length - BitVecCountOnes(bitvec);
    }

In BitVec.c:616:

    ValidateBitVec(bv2);
    
    u64 weight1 = BitVecCountOnes(bv1);
    u64 weight2 = BitVecCountOnes(bv2);

In BitVec.c:617:

    
    u64 weight1 = BitVecCountOnes(bv1);
    u64 weight2 = BitVecCountOnes(bv2);
    
    if (weight1 < weight2) {

In BitVec.c:1214:

    
    u64 dot_product = BitVecDotProduct(bv1, bv2);
    u64 ones1       = BitVecCountOnes(bv1);
    u64 ones2       = BitVecCountOnes(bv2);

In BitVec.c:1215:

    u64 dot_product = BitVecDotProduct(bv1, bv2);
    u64 ones1       = BitVecCountOnes(bv1);
    u64 ones2       = BitVecCountOnes(bv2);
    
    if (ones1 == 0 || ones2 == 0) {

In BitVec.c:1331:

    return 0.0;
    
    u64 ones  = BitVecCountOnes(bv);
    u64 zeros = bv->length - ones;

In BitVec.Access.Deadend.c:167:

    
    // Test NULL bitvec pointer - should abort
    BitVecCountOnes(NULL);
    
    return false;

In BitVec.Access.Simple.c:139:

    
    // Count true and false bits
    bool result = (BitVecCountOnes(&bv) == 3) && (BitVecCountZeros(&bv) == 2);
    
    BitVecDeinit(&bv);

In BitVec.Access.Simple.c:213:

    
    // Test empty bitvector
    result = result && (BitVecCountOnes(&bv) == 0);
    result = result && (BitVecCountZeros(&bv) == 0);

In BitVec.Access.Simple.c:218:

    // Test single bit
    BitVecPush(&bv, true);
    result = result && (BitVecCountOnes(&bv) == 1);
    result = result && (BitVecCountZeros(&bv) == 0);

In BitVec.Access.Simple.c:226:

    BitVecPush(&bv, true);
    }
    result = result && (BitVecCountOnes(&bv) == 100);
    result = result && (BitVecCountZeros(&bv) == 0);

In BitVec.Access.Simple.c:256:

    
    // Count and verify
    result = result && (BitVecCountOnes(&bv) == 3);
    result = result && (BitVecCountZeros(&bv) == 2);

In BitVec.Access.Simple.c:263:

    BitVecFlip(&bv, 3); // F -> T
    
    result = result && (BitVecCountOnes(&bv) == 5);
    result = result && (BitVecCountZeros(&bv) == 0);

In BitVec.Access.Simple.c:289:

    
    // Verify counts
    result = result && (BitVecCountOnes(&bv) == 500);
    result = result && (BitVecCountZeros(&bv) == 500);

In BitVec.Access.Simple.c:298:

    BitVecFlip(&bv, 999); // F -> T
    
    result = result && (BitVecCountOnes(&bv) == 500);
    result = result && (BitVecCountZeros(&bv) == 500);

In BitVec.Access.Simple.c:328:

    
    // Test count operations
    result = result && (BitVecCountOnes(&bv) == 1);
    result = result && (BitVecCountZeros(&bv) == 1);

In BitVec.Access.Simple.c:364:

    }
    
    result = result && (BitVecCountOnes(&bv) == expected_true_count);
    result = result && (BitVecCountZeros(&bv) == (size - expected_true_count));

In BitVec.Access.Simple.c:397:

    }
    result = result && (BitVecCountZeros(&bv) == 64);
    result = result && (BitVecCountOnes(&bv) == 0);
    
    // Test all ones

In BitVec.Access.Simple.c:404:

    BitVecPush(&bv, true);
    }
    result = result && (BitVecCountOnes(&bv) == 64);
    result = result && (BitVecCountZeros(&bv) == 0);

In BitVec.Access.Simple.c:412:

    BitVecPush(&bv, i % 2 == 0);
    }
    result = result && (BitVecCountOnes(&bv) == 32);
    result = result && (BitVecCountZeros(&bv) == 32);

In BitVec.Access.Simple.c:420:

    BitVecPush(&bv, i % 8 == 0);
    }
    result = result && (BitVecCountOnes(&bv) == 8);
    result = result && (BitVecCountZeros(&bv) == 56);

In BitVec.Access.c:172:

    
    // Test counting
    bool result = (BitVecCountOnes(&bv) == 3);
    result      = result && (BitVecCountZeros(&bv) == 4);

In BitVec.Access.c:181:

    BitVecPush(&bv, true);
    
    result = result && (BitVecCountOnes(&bv) == 3);
    result = result && (BitVecCountZeros(&bv) == 0);

In BitVec.Access.c:259:

    
    // Test count on empty bitvec
    result = result && (BitVecCountOnes(&bv) == 0);
    result = result && (BitVecCountZeros(&bv) == 0);

In BitVec.Access.c:264:

    // Test count with single bit
    BitVecPush(&bv, true);
    result = result && (BitVecCountOnes(&bv) == 1);
    result = result && (BitVecCountZeros(&bv) == 0);

In BitVec.Access.c:269:

    BitVecClear(&bv);
    BitVecPush(&bv, false);
    result = result && (BitVecCountOnes(&bv) == 0);
    result = result && (BitVecCountZeros(&bv) == 1);

In BitVec.Access.c:277:

    BitVecPush(&bv, true);
    }
    result = result && (BitVecCountOnes(&bv) == 1000);
    result = result && (BitVecCountZeros(&bv) == 0);

In BitVec.Access.c:434:

    }
    
    result = result && (BitVecCountOnes(&bv) == 0);
    result = result && (BitVecCountZeros(&bv) == 100);

In BitVec.Access.c:447:

    }
    
    result = result && (BitVecCountOnes(&bv) == 100);
    result = result && (BitVecCountZeros(&bv) == 0);

In BitVec.Access.c:456:

    }
    
    result = result && (BitVecCountOnes(&bv) == 50);
    result = result && (BitVecCountZeros(&bv) == 50);

In BitVec.Access.c:599:

    
    // Test NULL bitvec pointer - should abort
    BitVecCountOnes(NULL);
    
    return false;

BitVecCountOnes

`BitVecCountOnes`

Description

Parameters

Usage example (from documentation)

Usage example (Cross-references)

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