如题,在Qt类中需要用到信号和槽时,需要在类里面加上Q_OBJECT,但是加上之后再编译会报错undefined reference to staticMetaObject,重新编译也不管用,此时选择“执行qmake”,执行完成之后再进行编译就好了。
2)在静态成员函数里面直接定义和使用 static 成员变量。 A.hpp class A { static void func() { static int i; i++; } } 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 参考: undefined reference to static private me - C++ Forum...
C++探究Undefined reference to static constexpr 背景# 在某个class中定义了static constexpr size_t value变量,调用如下: std::vector<std::pair<size_t,size_t>> vec;vec.push_back({0, value}); release编译可以通过,debug编译时报错Undefined reference to XXX::value。 分析# 对于gcc而言constexpr变量属...
c++静态变量报错undefinedreferencetostaticmembers c++中静态变量不但要在头⽂件中declare，还要在实现的cpp中declare。当然也可以赋个初始值。class foo { int _i;public:foo(int i) : _i(i) {} };class bar { public:static int j;static foo f;};int bar::j = 0;foo bar::f(1);
Apparently, static_assert is not guaranteed if no c++ toolchain is used under uClibc. This is used by fluent-bit, which I'm trying to compile for uClibc toolchains in buildroot. I found out that this patch is enough to fix it: From 30eae...
c++ 静态变量报错 undefined reference to static members,c++中静态变量不但要在头文件中declare,还要在实现的cpp中declare。当然也可以赋个初始值。classfoo{int_i;public:foo(inti):_i(i){}};classbar{public:staticintj;staticfoof;};intbar::j=0;foobar::f(1);
classfoo {int_i;public: foo(inti) : _i(i) {} };classbar {public:staticintj;staticfoo f; };intbar::j = 0; foo bar::f(1); Dec 8, 2011 at 10:23am subjugater(71) It works now. Thanks, bbgst! Topic archived. No new replies allowed....
undefined reference to static private member Feb 5, 2014 at 4:30amclosed account (1v5E3TCk)Hi guys, It has been too long since I was last here to ask a question. Okey here is my problem: I am coding a map editor for my friends game and I have a problem. When I try to ...(...
这个问题在于你没有使用类的限定符，你在类外定义类的成员函数的时候，应该在函数名前面加上 类名:: ,在你的程序中，也就是在类外定义函数的时候，应该是 A::fun,而不是只有一个fun！另，在类外定义的时候，static这个关键词可以去掉
静态成员变量需要在类体外定义，类体里的只算是声明：看如下的修改：include<iostream>using namespace std;class CSingleton{ //其他成员public: static CSingleton* GetInstance(); int age; private: CSingleton(){}; static CSingleton* m_pInstance;};CSingleton* CSingleton:...