An array of C + +/CLI managed + + introduces "4"

Managed arrays are actually objects of type System::Array , so managed arrays created in a C + +/CLI program can use the various methods and properties provided by the class.

[1] Definition

[Qualifiers] [CLI::] array<[qualifiers]type[,dimension]> ^var;

Qualifiers

Storage method Description (optional). Selectable storage options include:mutable,volatile,const,extern , and STATC.

Array

The keyword for the managed array definition, which is defined in the CLI name domain. The using namespace CLI in a managed program project; is implied, so the name field of the array indicates the CLI:: Can be omitted

Type

The type name of the managed array element. The types that can be selected include the handle of the type ^ name, the value type name, or the local pointer name (for example, the value type's * pointer name).

Dimension

The number of dimensions of the managed array. The default dimension is 1 and the maximum number of dimensions is 32.

Var

The managed array name.

For example:

array<string^> ^ strArray1; One-dimensional string^ managed array

array<double, 2> ^ doublearray; Two-dimensional double-managed array

[2] Creating

var= gcnew [CLI::] array<[qualifiers]type[, Dimension]> (val[, Val ...]);

gcnew The managed object creation operator.

Val managed array specifies dimensions of dimensions

For example:

StrArray1 = gcnew array<string^> (50);

Doublearray = gcnew array<double, 2> (10, 10);

The creation of managed arrays can also be implemented using class System::Array , which provides methods CreateInstance to create managed array instances, for example: array<int> ^intarray =array: : CreateInstance (int, 100);

[3] Initialization

array<string^, 2>strarray =gcnew array<string^, 2>{

{L "John", L "male", L "New York"},

{L "Merry", L "female", L "Washington"}};

[3] Access

Access to managed arrays can be through subscript operators, or by using the GetValue and SetValue methods of class System::Array

int value = Intarray[5];

String ^str = strarray[2, 0];

String ^str = strarray->getvalue (2, 0);

Strarray->setvalue (L "Henrry", 2, 0);

[3] Sorting ( sorting method can only be used for one-dimensional arrays )

Class System::Array defines multiple versions of the static method sort to meet the multiple ordering needs of an array, for example, to sort all built-in numeric elements by default comparison algorithm (numeric ascending), Sort some built-in numeric elements by default comparison algorithm (numeric ascending), sort all built-in numeric elements in descending order, sort all custom elements by custom comparison algorithm, etc.

For example:

Intarray all elements are sorted by ascending algorithm:

Array::sort (Intarray);

Intarray the elements in the lower order 1 through 5 are sorted by ascending algorithm:

Array::sort (Intarray, 1, 5);

[4] Lookup ( Find method can only be used for one-dimensional arrays )

Class System::Array provides multiple versions of a static method BinarySearch to satisfy multiple query needs for an array, such as querying a specified element in all built-in numeric elements, Queries the specified element in a partially built-in numeric element, and queries the specified element by a custom algorithm in all custom type elements.

For example:

The statement that queries the specified element in all elements of the Intarray:

int pos = Array::binarysearch (Intarray, (object^) 25);

Returns the subscript position of the element in the array if the element being queried exists, otherwise returns-1.

An array of C + +/CLI managed + + introduces "4"