FAQ Arrays from Microsoft

[John Alexiou]

included is the contents of  langaugefeatures/arrays/arrays.cpp from the samples in VC++. This is how I learned the 'Object * foo() []' tricks..

- - - - - - - - - - - - - - -

///////////////////////////////////////////////////////////////////////////////

//

// Copyright (C) Microsoft Corp 2000. All rights reserved.

//

// Run: cl /CLR arrays.cpp

//

// Description: Show the creation and use of both single-dimensional

// and multi-dimensional CLR arrays

//

///////////////////////////////////////////////////////////////////////////////

#using

<mscorlib.dll>

using

namespace System;

///////////////////////////////////////////////////////////////////////////////////////////

int

nFailures = 0;

int

Assert(const char *pMsg)

{

Console

::Write(L"Test failed:\t");

Console

::WriteLine(pMsg);

return ++nFailures;

}

#define

ASSERT(f) ((f) || Assert(#f))

///////////////////////////////////////////////////////////////////////////////////////////

public

__gc class X {

public

:

X

(int nData)

: m_nData(nData) {

}

int get() {

return m_nData;

}

String

* m_pStr;

private

:

int m_nData;

};

public

__value class V {

public

:

String

*s;

};

//

// Function returning a multi-dimensional CLR array

// The array is a CLR array because the base type is a managed class

//

X

* func1() [,]

{

X

*rX[,] = new X *[10, 10];

rX

[5, 5] = new X(99);

return rX;

}

//

// Function returning single-dimensional CLR array

// The array is a CLR array because the base type is a managed class

//

X

* func2()[]

{

X

*rX[] = new X*[10];

rX

[5] = new X(55);

return rX;

}

//

// Function returning a multi-dimensional CLR array

// The array is explicitly managed

//

int

func3() __gc[,]

{

int rInt __gc[,] = new int __gc[10, 10];

rInt

[5,5] = 123;

return rInt;

}

//

// Function returning a single-dimensional CLR array

// The array is explicitly managed

//

int

func4() __gc[]

{

int rInt __gc[] = new int __gc[10];

rInt

[5] = 456;

return rInt;

}

int

main()

{

//

// Create a 1-dimensional managed array of int

//

int rInt __gc[] = new int __gc[10];

ASSERT

(rInt->Count == 10);

ASSERT

(rInt->Rank == 1);

//

// Create a 5-dimensional managed array of X

//

X

* rX[,,,,] = new X *[3, 3, 3, 3, 3];

rX

[2, 2, 2, 2, 2] = new X(99);

rX

[2, 2, 2, 2, 2]->m_pStr = S"managedStr";

//

// Note: Double braces needed since the parameter for the ASSERT macro

// contains commas (',')

//

ASSERT

((rX[2, 2, 2, 2, 2]->get() == 99) );

ASSERT

((rX[2, 2, 2, 2, 2]->m_pStr->Equals(S"managedStr")));

ASSERT

((func1()[5, 5]->get() == 99));

ASSERT

((func2()[5]->get() == 55));

ASSERT

((func3()[5,5] == 123));

ASSERT

(func4()[5] == 456 );

//

// Create a multi-dimensional array of Strings

//

String

* rStr[,] = new String *[10, 10];

rStr

[5, 5] = S"Hello";

ASSERT

((rStr[5, 5]->Equals(S"Hello")));

//

// Create a single-dimensional and multi-dimensional arrays of value-types

//

V rV1

[] = new V[10];

V rV2

[,] = new V[10, 10];

ASSERT

(rV1->Rank == 1);

ASSERT

(rV2->Rank == 2);

if (nFailures == 0) {

Console

::WriteLine(L"Passed");

}

else {

Console

::WriteLine(L"Failed");

}

return nFailures;

}

 

[Nish [void main]]

>> included is the contents of langaugefeatures/arrays/arrays.cpp
>> from the samples in VC++.

Hmmm. I don't have this folder or this file. What version of VS.NET do you
have? Puzzling :-(

Nish