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Function `std.array.uninitializedArray`

Returns a new array of type T allocated on the garbage collected heap without initializing its elements. This can be a useful optimization if every element will be immediately initialized. T may be a multidimensional array. In this case sizes may be specified for any number of dimensions from 0 to the number in T.


						
				auto auto uninitializedArray(T, I...)
				(
				

				  I sizes
				

				) nothrow @system
				

				if (isDynamicArray!T && allSatisfy!(isIntegral, I) && hasIndirections!(ElementEncodingType!T));
				

				

				auto auto uninitializedArray(T, I...)
				(
				

				  I sizes
				

				) nothrow @trusted
				

				if (isDynamicArray!T && allSatisfy!(isIntegral, I) && !hasIndirections!(ElementEncodingType!T));

uninitializedArray is nothrow and weakly pure.

uninitializedArray is @system if the uninitialized element type has pointers.

Parameters

Name	Description
T	The type of the resulting array elements
sizes	The length dimension(s) of the resulting array

Returns

An array of T with I.length dimensions.

Example

double[] arr = uninitializedArray!(double[])(100);
writeln(arr.length); // 100

double[][] matrix = uninitializedArray!(double[][])(42, 31);
writeln(matrix.length); // 42
writeln(matrix[0].length); // 31

char*[] ptrs = uninitializedArray!(char*[])(100);
writeln(ptrs.length); // 100

Authors

Andrei Alexandrescu and Jonathan M Davis

License

Boost License 1.0.