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...
main.c:(.text+0x7): undefined reference to `test' collect2: ld returned 1 exit status 这就是最典型的undefined reference错误,因为在链接时发现找不到某个函数的实现文件,本例中test.o文件中包含了test()函数的实现,所以如果按下面这种方式链接就没事了。 gcc -o main main.o test.o 【扩展】:其实...
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变量属于compile time const是不存在地址的, 任何取值不涉及地...
a(library.o): In function `Library::Library(QString)': Makefile:214: recipe for target 'Application' failed /home/mint/Development/test/build-Library-Desktop_Qt_5_5_1_GCC_64bit-Ladění/../Library/library.cpp:6: undefined reference to `Library::name' collect2: error: ld returned 1 ex...
foo(static_cast<int>(kConst)); I believe this is now forcing the compiler to make a temporary int, and then pass a reference to that, which it can successfully do at compile time. I was wondering if this was intentional, or am I expecting too much from gcc to be able to handle th...
访问类的静态成员变量的时候出现undefined reference to #include <iostream> using namespace std; class CSingleton { //其他成员 public: static CSingleton* GetInstance(); int age; private: CSingleton(){}; static CSingleton* m_pInstance; }; CSi
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);
{ //其他成员 public: static CSingleton* GetInstance(); int age; private: CSingleton(){}; static CSingleton* m_pInstance; }; CSingleton* CSingleton::GetInstance() { if ( m_pInstance == NULL ) //判断是否第一次调用 m_pInstance = new CSingleton(); ...
静态成员函数 不属于任何对象，他内部不能直接修改非静态的成员 你可以把要修改的对象 当形参传入
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:...