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为什么我在这里遭受循环依赖？(Why am I suffering Circular Dependency here?)

 Utilities.h  
#ifndef _UTILITIES_
#define _UTILITIES_

#include "MyFirstCairoPlugin.h"

class PLUG_CLASS_NAME;

class Utilities
{
private:
    PLUG_CLASS_NAME *pPlug;

public:
    Utilities(PLUG_CLASS_NAME *plug);
    ~Utilities();
};

#endif // !_UTILITIES_
 
 Utilities.cpp  
#include "Utilities.h"

Utilities::Utilities(PLUG_CLASS_NAME *plug) : pPlug(plug) {
    IColor color = IColor(100, 100, 100, 255);
}
Utilities::~Utilities() {

}
 
 这是我遇到麻烦的地方，使用MyFirstCairoPlugin.h这个classe：  
#ifndef _MYFIRSTCAIROPLUGIN_
#define _MYFIRSTCAIROPLUGIN_

#include "IPlug_include_in_plug_hdr.h"
#include "resource.h"

#include "Utilities.h"

//class Utilities;

class MyFirstCairoPlugin : public IPlug
{
private:

public:
    Utilities *pUtilities;

    MyFirstCairoPlugin(IPlugInstanceInfo instanceInfo);
    ~MyFirstCairoPlugin();
};

#endif // !_MYFIRSTCAIROPLUGIN_
 
 如果我不取消评论//class Utilities; （前向声明），它无法使用实用工具（即使我已将其包含在上面，使用#include "Utilities.h" ）。 它给了我“典型的”循环依赖性错误`：  
syntax error: missing ';' before '*' (compiling source file ..\..\..\IPlug_AddOns\Utilities.cpp)
 
 我哪里错了？ 

Utilities.h 
#ifndef _UTILITIES_
#define _UTILITIES_

#include "MyFirstCairoPlugin.h"

class PLUG_CLASS_NAME;

class Utilities
{
private:
    PLUG_CLASS_NAME *pPlug;

public:
    Utilities(PLUG_CLASS_NAME *plug);
    ~Utilities();
};

#endif // !_UTILITIES_
 
Utilities.cpp 
#include "Utilities.h"

Utilities::Utilities(PLUG_CLASS_NAME *plug) : pPlug(plug) {
    IColor color = IColor(100, 100, 100, 255);
}
Utilities::~Utilities() {

}
 
And this is where I've trouble, using this classe from MyFirstCairoPlugin.h: 
#ifndef _MYFIRSTCAIROPLUGIN_
#define _MYFIRSTCAIROPLUGIN_

#include "IPlug_include_in_plug_hdr.h"
#include "resource.h"

#include "Utilities.h"

//class Utilities;

class MyFirstCairoPlugin : public IPlug
{
private:

public:
    Utilities *pUtilities;

    MyFirstCairoPlugin(IPlugInstanceInfo instanceInfo);
    ~MyFirstCairoPlugin();
};

#endif // !_MYFIRSTCAIROPLUGIN_
 
If I don't de-comment //class Utilities; (forward declaration), it is not able to use Utilities (even if I've included it above, with #include "Utilities.h"). It gives to me the "typical" Circular Dependency error `: 
syntax error: missing ';' before '*' (compiling source file ..\..\..\IPlug_AddOns\Utilities.cpp)
 
Where am I wrong?

原文：https://stackoverflow.com/questions/40991478

更新时间：2023-07-18 07:07

最满意答案

 所以这是我的答案：  
$pid=0;
$pid=$ssh->exec("(ps -ef | grep run.php | grep -v grep | awk '{print $2}')");

while ($pid >0)
{
echo "Process id when running=".$pid."\n";
$pid =$ssh->exec("(ps -ef | grep run.php | grep -v grep | awk '{print $2}')");
}
echo "Process is not running \n";
 
 说明：从Linux开始，输出将如下所示  
bash-3.2$ ps -ef | grep run.php 
506       1455     1   3 10:56 ?        00:00:02 /path/to/script/run.php
 
 所以awk'{print $ 2}'将提供值1455，这是该过程的pid 

So here is my answer: 
$pid=0;
$pid=$ssh->exec("(ps -ef | grep run.php | grep -v grep | awk '{print $2}')");

while ($pid >0)
{
echo "Process id when running=".$pid."\n";
$pid =$ssh->exec("(ps -ef | grep run.php | grep -v grep | awk '{print $2}')");
}
echo "Process is not running \n";
 
Explanation: From Linux the output will be as bellow 
bash-3.2$ ps -ef | grep run.php 
506       1455     1   3 10:56 ?        00:00:02 /path/to/script/run.php
 
So awk '{print $2}' will provide value 1455 which is the pid of the process

为什么我在这里遭受循环依赖？(Why am I suffering Circular Dependency here?)

最满意答案

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