Return the number of 1 bits in the optionally specified range.

Synopsis

Declared in <bdlc_bitarray.h>

std::size_t
num1(
    std::size_t begin = 0,
    std::size_t end = k_INVALID_INDEX) const;

Description

Return the number of bits in the range optionally specified by begin and end having a value of 1. The range is [begin .. effectiveEnd)], where effectiveEnd == length() if end is not specified and effectiveEnd == end otherwise. The behavior is undefined unless begin <= effectiveEnd <= length().

Return Value

number of 1 bits in the range

Parameters

Name

Description

begin

start of the counted range (inclusive)

end

end of the counted range (exclusive); length if omitted

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