The D Programming Language's Unofficial Docs
beta
The D Programming Language's Unofficial Docs
beta
An input range of tuples of keys and values.
A newly allocated associative array out of elements of the input range, which must be a range of tuples (Key, Value) or a range of keys and a range of values. If given two ranges of unequal lengths after the elements of the shorter are exhausted the remaining elements of the longer will not be considered. Returns a null associative array reference when given an empty range. Duplicates: Associative arrays have unique keys. If r contains duplicate keys, then the result will contain the value of the last pair for that key in r.
1 import std.range : repeat, zip; 2 import std.typecons : tuple; 3 import std.range.primitives : autodecodeStrings; 4 auto a = assocArray(zip([0, 1, 2], ["a", "b", "c"])); // aka zipMap 5 static assert(is(typeof(a) == string[int])); 6 assert(a == [0:"a", 1:"b", 2:"c"]); 7 8 auto b = assocArray([ tuple("foo", "bar"), tuple("baz", "quux") ]); 9 static assert(is(typeof(b) == string[string])); 10 assert(b == ["foo":"bar", "baz":"quux"]); 11 12 static if (autodecodeStrings) 13 alias achar = dchar; 14 else 15 alias achar = immutable(char); 16 auto c = assocArray("ABCD", true.repeat); 17 static assert(is(typeof(c) == bool[achar])); 18 bool[achar] expected = ['D':true, 'A':true, 'B':true, 'C':true]; 19 assert(c == expected);
Returns a newly allocated associative array from a range of key/value tuples or from a range of keys and a range of values.