forward declaration of class 错误 在使用Qt的时候遇到这个错误,查了一下发现,是因为我没有正确的使用前置声明。 1#ifndef FIRSTPAGE_H2#defineFIRSTPAGE_H34#include"ui_dialog.h"5//#include <QWizardPage>6classQWizardPage;78classFirstPage :publicUi::Dialog,publicQWizardPage9{10public:11FirstPage();1...
Qt头文件引用其他类,主类头文件报错(1)invalid use of incomplete type 'class xx::yy' (2)forward declaration of 'class xx::yy' 其实这个错误很蠢,由于代码是从cpp文件直接copy过来的就没仔细看,但是他这个报错很有迷惑性,我们来看图: 就这行代码,从cpp文件中复制过来的: 本来目的呢就是提升这个变量的作...
WgUserModel.h:16:26:error:attempting to use the forwardclass'WgBaseObject'assuperclassof'WgUserModel'@interfaceWgUserModel:WgBaseObject^WgUserModel.h:14:22:note:forward declarationofclasshere@classPicturesModel,WgBaseObject; 意思是WgUserModel编译时父类WgBaseObject还未编译,一般是在pch文件里父类没有在...
orward declaration isnotsupported as://#include <QtGui>//class QCheckBox;//class QLabel;//class QLineEdit;//class QPushButton;must be replaced by:#include<QDialog>#include<QLabel>#include<QPushButton>#include<QLineEdit>#include<QCheckBox>#include<QHBoxLayout>QT4.82support forward declaration,QT...
class weak_ordering { public: operator partial_ordering() const { return partial_ordering(static_castQtPrivate::Ordering(m_order)); } private: QtPrivate::CompareUnderlyingType m_order; }; As you can see in the Qt bug report, the compilation fails, due to a highly suspicious c...
forward declaration of 'class weapon' 什么是正标题中的“forward declaration of 'class weapon'”呢?简而言之,它是指在C++中,我们可以在使用之前提前声明一个类,而不需要立即定义该类的细节。这种提前声明的语法称为前向声明。 前向声明的出现是为了解决编译器需要知道类的完整定义才能进行编译的问题。通过使用...
I also have a forward-declaration of a template class like this: template <class T> class NDataObjectTx; class NETLIBC_EXPORT netLibC { template <typename T> bool getDataObject(NDataObjectTx<T> **dataObject); ... In linux everything compiles without a problem but in windows I'm getti...
Forward Declaration What is wrong? Fig. 1 In fig.1, the header file of class B contains the header file of Class D and E. We assume the implementation of Class A needs contents of class B and Class E. we decide that... hiphop原理分析2 原创--胡志广 ...
是哦,你说的对,MSVC下上面的写法的确是没问题,那因为MSVC提供了这个特征,但放在gcc下编译试试,立即报错: use of enum E without previous declaration 因为C++98标准中没有支持枚举类型前向声明,所以就不能保证上面的写法对任何编译器都行。为什么枚举类型不能被前向声明呢? 因为编译器无法知道枚举变量所需的存储...