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Function object.capacity
(Property) Get the current capacity of a slice. The capacity is the size
that the slice can grow to before the underlying array must be
reallocated or extended.
If an append must reallocate a slice with no possibility of extension, then 0 is returned. This happens when the slice references a static array, or if another slice references elements past the end of the current slice.
Prototype
size_t capacity(T)( T[] arr ) pure nothrow @property;
Note
The capacity of a slice may be impacted by operations on other slices.
Example
//Static array slice: no capacity
int[4] sarray = [1, 2, 3, 4];
int[] slice = sarray[];
assert(sarray.capacity == 0);
//Appending to slice will reallocate to a new array
slice ~= 5;
assert(slice.capacity >= 5);
//Dynamic array slices
int[] a = [1, 2, 3, 4];
int[] b = a[1 .. $];
int[] c = a[1 .. $ - 1];
debug(SENTINEL) {} else // non-zero capacity very much depends on the array and GC implementation
{
assert(a.capacity != 0);
assert(a.capacity == b.capacity + 1); //both a and b share the same tail
}
assert(c.capacity == 0); //an append to c must relocate c.
Authors
Walter Bright, Sean Kelly