unsafemutablepointer.swift

/// A pointer to an object of type `Memory`.  This type provides no automated
/// memory management, and therefore the user must take care to allocate
/// and free memory appropriately.
///
/// The pointer should be aligned to `alignof(Memory.self)`.
///
/// The pointer can be in one of the following states:
///
/// - memory is not allocated (for example, pointer is null, or memory has
///   been deallocated previously);
///
/// - memory is allocated, but value has not been initialized;
///
/// - memory is allocated and value is initialized.
public struct UnsafeMutablePointer<Memory> : Equatable, Hashable, NilLiteralConvertible, _PointerType, BidirectionalIndexType, ForwardIndexType, _Incrementable, RandomAccessIndexType, Strideable, Comparable, _Strideable, _RandomAccessAmbiguity {

~~~中略~~~

    /// Allocate memory for `num` objects of type `Memory`.
    ///
    /// - Postcondition: The memory is allocated, but not initialized.
    @warn_unused_result
    public static func alloc(num: Int) -> UnsafeMutablePointer<Memory>