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Function std.numeric.sumOfLog2s

Compute the sum of binary logarithms of the input range r. The error of this method is much smaller than with a naive sum of log2.

ElementType!Range sumOfLog2s(Range) (
  Range r
if (isInputRange!Range && isFloatingPoint!(ElementType!Range));


import std.math.traits : isNaN;

writeln(sumOfLog2s(new double[0])); // 0
writeln(sumOfLog2s([0.0L])); // -real.infinity
writeln(sumOfLog2s([-0.0L])); // -real.infinity
writeln(sumOfLog2s([2.0L])); // 1
writeln(sumOfLog2s([real.infinity])); // real.infinity
writeln(sumOfLog2s([0.25, 0.25, 0.25, 0.125])); // -9


Andrei Alexandrescu, Don Clugston, Robert Jacques, Ilya Yaroshenko


Boost License 1.0.