I'm trying to use C++ code in my ios app (I really don't like objective C, I'm going to use it only when necessary [view control, etc]) and while everything seems to be working I get an error in the following test file.
#ifndef prueba3_GlobalStatic_h
#define prueba3_GlobalStatic_h
#include <string>
using namespace std;
class GlobalStatic
{
public:
GlobalStatic();
~GlobalStatic();
string foo();
private:
int integerValue;
};
#endif
When I try to build the project the IDE gives me the following error:
" 'string' file not found"
I've looked around but cannot find a conclusive answer; any help would be appreciated. In essence, how do I get the standard library working?
One cause of missing c++ headers is including them from an objective-c context as opposed to from objective-c++ -- and you can't use the c++ stl from c! The easier solution is to simply change all your .m files to .mm, .mm will send them to the objective-c++ compiler.
Related
First time question asker here, so bear with me. So I've got a grammar file from the grammars repository that I'm trying to use with C++. (Developing on macOS). I have no issue generating the lexer and parser using ANTLR. But after that, I have no idea how to run/use the resulting .cpp and .h files. I understand that there is an antlr runtime that I must download, and I have done so from the antlr.org website (gives me two folders, antlr4-runtime and lib), but my novice understanding of C++ seems to be preventing me from getting any further than that. How do I use the runtime to work with these files? I'm not using an IDE, just g++ from the command line. Thank you for any help!
I found this guide helpful: Getting Started with ANTLR in C++. (Ah, saw #ggorlen's comment after.)
If you scroll down on that page to a little past halfway, there's a section titled How to Use ANTLR in C++. I think that's where you are.
I'll copy that example over as SO generally prefers this. Say this is your main.cpp:
#include <iostream>
#include "antlr4-runtime/antlr4-runtime.h"
#include "antlr4-runtime/SceneLexer.h"
#include "antlr4-runtime/SceneParser.h"
#include "ImageVisitor.h"
using namespace std;
using namespace antlr4;
int main(int argc, const char* argv[]) {
std::ifstream stream;
stream.open("input.scene");
ANTLRInputStream input(stream);
SceneLexer lexer(&input);
CommonTokenStream tokens(&lexer);
SceneParser parser(&tokens);
SceneParser::FileContext* tree = parser.file();
ImageVisitor visitor;
Scene scene = visitor.visitFile(tree);
scene.draw();
return 0;
}
You want to include your lexer and parser .h (header) files instead of the SceneLexer/Parser in the example, and also include antlr4-runtime.h. Then run g++ on all your .cpp files, e.g.
$ g++ main.cpp YourLexer.h YourParser.h
I know, it may seem strange, but my goal is to undefine a class in C++. The root of the problem is in combining TinyXML2 and Boost unit tests.
Contents of the header file (Configuration.h) which is being tested:
...
#include <tinyxml2.h>
...
And this is the contents of my configurationTests.h file:
#include "unitTests.h"
#include "Configuration.h"
BOOST_AUTO_TEST_SUITE(configuration_test)
BOOST_AUTO_TEST_CASE(basic) {
...
}
BOOST_AUTO_TEST_SUITE_END( )
When I try to compile my tests, I'm getting an error:
error C2371: 'XMLDocument' : redefinition; different basic
types c:\program files (x86)\windows kits\8.0\include\um\msxml.h 10085
Inside this file (msxml.h) on line 10085 we have this class definition:
class DECLSPEC_UUID("CFC399AF-D876-11d0-9C10-00C04FC99C8E")
XMLDocument;
When I remove those two lines, my tests do compile and everything seems fine. Of course, this is not a solution, but that fact prooves that something inside Boost unit tests library includes msxml.h and somehow leads to conflict with TinyXML2 library.
I tried different solutions found in Google (like writing "#define WIN32_LEAN_AND_MEAN"), removing "using namespace tinyxml2" and making changes inside tinyxml2.cpp - nothing actually helps.
So, my question is simple: can I undefine (unload?) previously defined class in compile time in some tricky way? I tried "#undef XMLDocument", "#define XMLDocument 1" + "#undef XMLDocument" - nothing works.
Update: Actually, I kinda solved the problem by writing "#define MSXML_LIBRARY_DEFINED" on the first line of configurationTests.h. But still, I would love to know an answer to this topic question.
I think you have used default namespace for tinyxml2.
Try to delete using namespace tinyxml2 and then use it like in this example:
tinyxml2::XMLDocument xDoc;
try this:
namespace your_name_space
{
#include <tinyxml2.h>
}
From now all classes inside the tinyxml2 are hidden by your namespace.
The namespece must be declared also for the tinyxml2.cpp file.
I have created a file called untitled1.cpp in dev-cpp with the following script:
#include <iostream.h>
using namespace std;
int main(){
cout << "C++";
return 0;
}
But the compiler shows errors like:
1 F:\Dev-Cpp\include\c++\3.4.2\backward\iostream.h:31,
from F:\Dev-Cpp\Untitled1.cpp In file included from
include/c++/3.4.2/backward/iostream.h:31, from
F:\Dev-Cpp\Untitled1.cpp 32:2
F:\Dev-Cpp\include\c++\3.4.2\backward\backward_warning.h #warning This
file includes at least one deprecated or antiquated header. Please
consider using one of the 32 headers found in section 17.4.1.2 of the
C++ standard. Examples include substituting the header for the
header for C++ includes, or instead of the deprecated
header . To disable this warning use -Wno-deprecated.
What is the error that I have? How do I fix it?
In C++ you import the standard library without using the .h suffix.
#include <iostream>
So your fixed example:
#include <iostream>
int main(int argc, char **argv) {
std::cout << "C++";
return 0;
}
Your code is not standard C++. You should say #include <iostream> (no ".h"!). Whatever source you have been learning this from is about 25 years out of date, and you should consider getting some more modern material.
(The "iostreams.h" header was part of a very early non-standard library in the early 1990s, and so it's being kept around for "compatibility" reasons, or to catch very inert programmers and give them a helpful hint.)
Use header file as #include<iostream> instead of #include<iostream.h>
Include iostream instead of iostream.h
This is just a warning.
I think that you could try to include iostream instead of iostream.h in order to fix it.
It says that the header, in this case, iostream.h is deprecated or antiquated. (You only have one header, so that's the one! Just read the error message!)
So you'll have to use iostream, not iostream.h.
You've posted the reason in your question already!
This file includes at least one deprecated or antiquated header.
The real question should therefore be: "Which one is antiquated, how do I replace it?", not "What's the error". Answer: Use <iostream>. The <*.h> versions are pre-standard, legacy headers.
So: Read error messages, people.
C++ newbie here. I'm trying to put some WIA functions in a DLL. I keep getting and undeclared identifier on the IWiaDevMgr variable. When creating the project I chose the Win32 Console Application and DLL application type. Not sure if it matters but I put the wiaguid.lib in the project
properties -> Linker -> input -> additional dependencies.
What is wrong with this code?
MyDLL.h
#include <wia.h>
namespace MyDLL
{
class MyFirstFuncs
{
public:
static __declspec(dllexport) int doWork();
};
}
MyDLL.cpp
#include "MyDLL.h"
namespace MyDLL
{
int MyFirstFuncs::doWork()
{
IWiaDevMgr *pIWiaDevMgr;
}
}
I had the exact same problem. Through trial and error I found that
#include <windows.h>
#include <wia.h>
fixed the problem.
I'm a C++ newbie also so couldn't tell you the exact reason why this works. Probably WIA is dependant on some definitions/macros/whatever in WINDOWS.H
Check the order in which you have included your header files. It may be the same problem like the one I had in programming a Directshow application. I had included vmr9.h before d3d9.h. During the build process, the compiler fired errors concerning d3d9 objects included in the vmr9.h. I had to reorder the inclusions to solve the problem
I have a C++ class that compiles fine on linux with gcc and on widows in visual studio.
boid.h:
#ifndef BOID_CLASS_HEADER_DEFINES_H
#define BOID_CLASS_HEADER_DEFINES_H
#include "defines.h"
class Boid {
public:
// Initialize the boid with random position, heading direction and color
Boid(float SceneRadius,float NormalVel);
.....
protected:
...
};
#endif
and in boid.cpp:
#include "Boid.h"
// Initialize the boid with random position, heading direction and color
Boid::Boid(float SceneRadius,float NormalVel)
{
....
}
However, I get the following error when I compile this code in Xcode:
Compiling Boid.h: "error: vector: No such file or directory"
Any ideas? I thought you could take C/C++ code and compile it in Xcode without issues?
Thanks
EDIT: Added defines.h (also added #endif to sample, but that was in the original code)
EDIT 2: I am getting a different error after a commenting out a couple of includes there were empty: the vector error above.
#ifndef BOID_NAV_DEFINES_H
#define BOID_NAV_DEFINES_H
#include <stdlib.h>
#include <vector>
#include "Vector3d.h"
#include "Point3d.h"
#include "win_layer.h"
#endif
Are you including the C++ header in a .m file?
.m files are treated as .c files with Objective-C extensions.
.mm files are treated as .cpp files with Objective-C extensions, then it's called Objective-C++
Just rename any .m file to .mm, right-click or ctrl-click and select rename on the file in Xcode.
Without changing any .m to .mm or anything like that, if you click your project, click tagets->build settings
go all the way down to "LLVM GCC 4.2 - Languages" (new xcode says "Apple LLVM compiler 4.2") you will see Compile Sources As change that value to Objective-C++;
I hope this will help.
After updating xCode to version 10, I have had issues including < map > and < vector > libraries. Found an easy solution by changing the C++ library type in the project's build settings (target's Build Settings):
C++ Standard Library: libc++ (LLVM C++ standard library with C++ 11 support)
Compiled without any problem.
Make sure you're compiling it as C++. Right click the file in XCode and select Get Info and make sure that File Type is set to sourcecode.cpp.cpp for the implementation files.
Assuming you're talking about the OS X XCode, that uses gcc to do the actual compiling. So there should be no difference between that and Linux, other than maybe different versions of gcc.
First thing that jumps out at me here is that you've typed "boid.h" as the name of the file, but you're including "Boid.h". Assuming that's not a typo, I would expect that to cause trouble on both Linux and OS X....
Edited to answer the new question: Hmmm... vector is definitely part of Xcode: /Developer/SDKs/MacOSX10.5.sdk/usr/include/c++/4.0.0/vector on my machine.
Further thought: If you port the source and makefiles from the Linux build over to the Mac, you can probably just compile it from the command line exactly like you do on Linux....
Definitely, something in defines.h is affecting the class definition.
This issue had two errors:
one of my includes had a typo which caused a compile error
the vector not found error was fixed by the .m files to .mm
Not sure if you forgot to paste, but you have an unterminated #ifndef
What's inside defines.h ?
Edit: You seem to have found the solution. One more remark:
#include <stdlib.h>
For C++, please:
#include <cstdlib>
:D