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Function std.range.SortedRange.lowerBound

This function uses a search with policy sp to find the largest left subrange on which pred(x, value) is true for all x (e.g., if pred is "less than", returns the portion of the range with elements strictly smaller than value). The search schedule and its complexity are documented in SearchPolicy.

auto lowerBound(SearchPolicy sp = SearchPolicy.binarySearch, V) (
  V value
if (isTwoWayCompatible!(predFun, ElementType!Range, V) && hasSlicing!Range);


import std.algorithm.comparison : equal;
auto a = assumeSorted([ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 ]);
auto p = a.lowerBound(4);
assert(equal(p, [ 0, 1, 2, 3 ]));


Andrei Alexandrescu, David Simcha, Jonathan M Davis, and Jack Stouffer. Credit for some of the ideas in building this module goes to Leonardo Maffi.


Boost License 1.0.