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Function std.experimental.allocator.shrinkArray

Shrinks an array by delta elements.

bool shrinkArray(T, Allocator) (
  auto ref Allocator alloc,
  ref T[] array,
  size_t delta

If array.length < delta, does nothing and returns false. Otherwise, destroys the last array.length - delta elements in the array and then reallocates the array's buffer. If reallocation fails, fills the array with default-initialized data.


T element type of the array being created
alloc the allocator used for getting memory
array a reference to the array being shrunk
delta number of elements to remove (upon success the new length of array is array.length - delta)


true upon success, false if memory could not be reallocated. In the latter case, the slice array[$ - delta .. $] is left with default-initialized elements.


The first two overloads throw only if alloc's primitives do. The overloads that involve copy initialization deallocate memory and propagate the exception if the copy operation throws.


int[] a = theAllocator.makeArray!int(100, 42);
writeln(a.length); // 100
assert(theAllocator.shrinkArray(a, 98));
writeln(a.length); // 2
writeln(a); // [42, 42]


Andrei Alexandrescu


Boost License 1.0.