shared_ptr not defined when including from managed code

Question

I'm trying to write a managed wrapper (C++/CLI) around an unmanaged C++ static library and am having two problems:

The unmanaged library uses std::shared_ptr in its headers. <memory> is included, and the header compiles as part of an unmanaged project. When I include this header in the managed project, however, I receive this error:

error C2039: 'shared_ptr' : is not a member of 'std'
How do I access the Values collection of a SortedDictionary<K, V> from C++/CLI? I cannot seem to find any examples of the proper syntax, and the C#-style syntax does not compile.

Code for #1:

// 1>Dummy.h(10): error C2039: 'shared_ptr' : is not a member of 'std'
#pragma once

#pragma managed(push, off)

#include <memory>

class Foo {};
typedef std::shared_ptr<Foo> FooPtr;

#pragma managed(pop)


using namespace System;

namespace Dummy {

    public ref class Class1
    {
    public:
        Class1(FooPtr);
    };
}

hi hi, cool that you found the error. Even if it's off-topic. The documentation state, that every #pragma managed(push, off) should have happened after the includes, which is obviously not possible for third-party-libraries but for STL headers possible. https://msdn.microsoft.com/en-us/library/0adb9zxe(v=vs.100).aspx — JackGrinningCat, Apr 16 '18 at 14:49

score 6 · Answer 1 · answered Jul 18 '11 at 18:35

6

shared_ptr lives in <memory> not <functional>. Make it look similar to this:

#pragma managed(push, off)
#include <memory>
#include "yourUnmanagedLibrary.h"
#pragma managed(pop)

Second question (ask only one please):

using namespace System::Collections::Generic; 
...
    SortedDictionary<int, String^>^ coll = gcnew SortedDictionary<int, String^>;
    coll->Add(1, "one");
    coll->Add(0, "zero");
    for each (String^ value in coll->Values) {
        Console::WriteLine(value);
    }

answered Jul 18 '11 at 18:35

Hans Passant

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Thank you, I had mistyped in the question. I am including `` and still having the exact same issue. I also already have the `#pragma managed` statements exactly as demonstrated. – Dark Falcon Jul 18 '11 at 18:37
I cannot see your screen from here. Post something that we can look at. – Hans Passant Jul 18 '11 at 18:39
Code added. Created a new Class Library project and placed this in the generated header file. – Dark Falcon Jul 18 '11 at 18:46
Works fine when I try it. Is the [visual-studio-2010] tag accurate? – Hans Passant Jul 18 '11 at 18:50
Yes it is. Version 10.0.30319.1 RTMRel. I don't believe I've installed SP1 yet. Perhaps I will give that a try. – Dark Falcon Jul 18 '11 at 18:56
Service Pack 1 did not change the issue. The test code still fails with the same error. – Dark Falcon Jul 18 '11 at 20:01
The #include for `` is including the file from VS2008 for some reason. Looks like the default include path points to the wrong directory. – Dark Falcon Jul 18 '11 at 20:09
Well, that's going to cause mayhem and misery. – Hans Passant Jul 18 '11 at 20:29
It already has! I've been banging my head on this for two hours. Still trying to find the exact resolution to the problem aside from hard-coding the correct paths in the project file. – Dark Falcon Jul 18 '11 at 20:31

score 3 · Accepted Answer · edited May 23 '17 at 10:27

3

I have found the answer here: Edit $(IncludePath) "macro" in Visual Studio 2010

Visual Studio 2010 is including the headers from Visual Studio 2008, which do not have shared_ptr.

The exact resolution is described here. The Platform Toolset on the General tab defaulted to vs90. Changing this to vs100 resolved the issue.

edited May 23 '17 at 10:27

Community

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answered Jul 18 '11 at 20:13

Dark Falcon

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shared_ptr not defined when including from managed code

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