Ecma Doc Stack Example

  • Thread starter Thread starter Don Kim
  • Start date Start date
D

Don Kim

I copied this example off ECMA C++/CLI draft document, and it doesn't
compile:

#using <mscorlib.dll>
using namespace System;

public ref class Stack {
public:
Stack() {
first = nullptr;
}

property bool Empty {
bool get() {
return (first == nullptr);
}
}

Object^ pop() {
if (first == nullptr)
throw gcnew Exception("Can't Pop from an empty Stack!");
else {
Object^ temp = first->Value;
first = first->Next;
return temp;
}
}

void Push(Object^ o) {
first = gcnew Node(o, first);
}

ref struct Node {
Node^ Next;
object^ Value;
Node(object^ value) : Node(value, nullptr) {}
Node(object^ value, Node^ next) {
Next = next;
Value = value;
}
};
private:
Node^ first;
};

int main()
{
Stack^ s = gcnew Stack();
for (int i = 0; i < 10; i++)
s->Push(i);
s = nullptr;
}

I get the following errors:

8_4.cpp
8_4.cpp(32) : error C2143: syntax error : missing ';' before '^'
8_4.cpp(32) : error C2501: 'Stack::Node::object' : missing storage-class or
type specifiers
8_4.cpp(32) : error C2501: 'Stack::Node::Value' : missing storage-class or
type specifiers
8_4.cpp(33) : error C2143: syntax error : missing ')' before '^'
8_4.cpp(33) : error C2143: syntax error : missing ';' before '^'
8_4.cpp(33) : error C3149: 'Stack::Node' : cannot use this type here without
a top-level '^'
8_4.cpp(33) : error C2059: syntax error : ')'
8_4.cpp(33) : error C2065: 'value' : undeclared identifier
8_4.cpp(33) : fatal error C1903: unable to recover from previous error(s);
stopping compilation

I'm using .Net 2.0 Beta. Any clues?

-Don Kim
 
Don said:
I copied this example off ECMA C++/CLI draft document, and it doesn't
compile:
Click to expand...

The project editor adapted this from a C# example before a compiler was
available and thus missed the capitalization of a few "object" identifiers.
He was also using the delegating constructor feature which we removed from
the standard due to the ISO C++ committee's interest in changing the design.

I've included a corrected sample below. Now that a compiler is available,
one of my tasks (somewhere around #50 on my to do list) is to extract all
the examples from our language specification and compile them.

--
Brandon Bray, Visual C++ Compiler http://blogs.msdn.com/branbray/
This posting is provided AS IS with no warranties, and confers no rights.


using namespace System;

public ref class Stack {
public:
Stack() {
first = nullptr;
}

property bool Empty {
bool get() {
return (first == nullptr);
}
}

Object^ pop() {
if (first == nullptr)
throw gcnew Exception("Can't Pop from an empty Stack!");
else {
Object^ temp = first->Value;
first = first->Next;
return temp;
}
}

void Push(Object^ o) {
first = gcnew Node(o, first);
}

ref struct Node {
Node^ Next;
Object^ Value;
Node(Object^ value) {
Next = nullptr;
Value = value;
}
Node(Object^ value, Node^ next) {
Next = next;
Value = value;
}
};
private:
Node^ first;
};

int main()
{
Stack^ s = gcnew Stack();
for (int i = 0; i < 10; i++)
s->Push(i);
s = nullptr;
}
 
I've included a corrected sample below. Now that a compiler is available,
one of my tasks (somewhere around #50 on my to do list) is to extract all
the examples from our language specification and compile them.
Click to expand...

Thanks for the corrections. Since there is no real tutorial yet on C++/CLI,
except things like your webcast on the VC site which I enjoyed and other
small snippets, I figure I'm going to learn about it as much as I can by
just reading the specs and running the examples. Here's another example
that did not compile:

#using <mscorlib.dll>
using namespace System;
using namespace stdcli::language;

void F(... array<int>^ args) {
Console::WriteLine("# of arguments: {0}", args->Length);
for (int i = 0; i < args->Length; i++)
Console::WriteLine("\targs[{0}] = {1}", i, args);
}

int main()
{
F();
F(1);
F(1, 2);
F(1, 2, 3);
F(gcnew array<int> {1, 2, 3, 4});
}

This one is for the parametized array. I get these errors:

8_3.cpp
8_3.cpp(5) : error C2144: syntax error : 'stdcli::language::array<Type>'
should be preceded by ')'
with
[
Type=int
]
8_3.cpp(5) : warning C4518: '?$array@H$00 ' : storage-class or type
specifier(s) unexpected here; ignored
8_3.cpp(5) : error C2143: syntax error : missing ';' before '^'
8_3.cpp(5) : error C2059: syntax error : ')'
8_3.cpp(5) : error C2470: 'args' : looks like a function definition, but
there is no formal parameter list; skipping apparent body

- Don Kim
 
Hi Brandon,
I've included a corrected sample below. Now that a compiler is available,
one of my tasks (somewhere around #50 on my to do list) is to extract all
the examples from our language specification and compile them.
Click to expand...

Need any help with that? ;)
 
Don said:
Thanks for the corrections. Since there is no real tutorial yet on
C++/CLI, except things like your webcast on the VC site which I enjoyed
and other small snippets, I figure I'm going to learn about it as much as
I can by just reading the specs and running the examples.
Click to expand...

I'm working hard towards getting more content, as are a few other people. In
any case, I'm happy to assist in forums however I can.
Here's another example that did not compile:
Click to expand...

This example regarding param arrays also demonstrates some unfinished work
in the compiler. Instead of using the ... for the param array, substitute
the actual attribute that goes into metadata:

System::Runtime::InteropServices::ParamArray

That will make it work now. Later you will be able to use the ... instead.
I've copied a corrected sample that compiles.

--
Brandon Bray, Visual C++ Compiler http://blogs.msdn.com/branbray/
This posting is provided AS IS with no warranties, and confers no rights.


using namespace System;
using namespace stdcli::language;
using namespace System::Runtime::InteropServices;


void F([ParamArray] array<int>^ args) {
Console::WriteLine("# of arguments: {0}", args->Length);
for (int i = 0; i < args->Length; i++)
Console::WriteLine("\targs[{0}] = {1}", i, args);
}

int main()
{
F();
F(1);
F(1, 2);
F(1, 2, 3);
F(gcnew array<int> {1, 2, 3, 4});
}
 
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