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Function object.byValue

Returns a forward range which will iterate over the values of the associative array. The values are returned by reference.

auto byValue(T, K, V) (
  T aa
) pure nothrow @nogc @safe;

auto byValue(T, K, V) (
  T* aa
) pure nothrow @nogc;

If structural changes are made to the array (removing or adding keys), all ranges previously obtained through this function are invalidated. The following example program will dereference a null pointer:

import std.stdio : writeln;

auto dict = ["k1": 1, "k2": 2];
auto valueRange = dict.byValue;
writeln(valueRange.front);    // Segmentation fault


aa The associative array.


A forward range referencing the values of the associative array.


auto dict = ["k1": 1, "k2": 2];
int sum;
foreach (v; dict.byValue)
    sum += v;

writeln(sum); // 3


Walter Bright, Sean Kelly


Boost License 1.0.