在C++的OOB编程中,有时候我们会遇到这样的错误Error: 'has incomplete type',forward declaration of 'class x',那么是什么原因引起的这个问题呢,我们首先来看下面这段代码: // Error: field '_a' has incomplete type 'A' // forward declaration of 'class A' class A; class B { public: B(A a): _a(a) {} private:…
在下面的程序中,在编译时会遇到下面的错误: error: field 'b' has incomplete type 域b是一个不完备的类型,即class B的声明不完备 #include <iostream> using namespace std; class A { private: class B b; public: A(){cout<<"this is A constructor!"<<endl;} }; class B { public…
error "base class has incomplete type" 如果base.h是你的基类,那么在子类derive中,写成如下形式: class base; class derive: public base{ } 那么就会出现如题的错误.解决这个错误的方法是:替换class base;成#include "base.h"…
Render QGraphicsItem on QPixmap: aggregate 'QWidget w' has incomplete type and cannot be defined #include <QWidget> and #include <QStyleOptionGraphicsItem> should fix the compile error you are getting. 常见错误: 头文件未包含…