由于C++用指向字符串位置的指针来表示字符串,因此ostream类重载了char型指针类型的插入运算符<<,即: ostream& operator<<(void*); ostream& operator<<(const char*); ostream& operator<<(const signed char*); ostream& operator<<(const unsigned char*); 后三种形式分别接受3种char型常指针,输出char型常指...
ostream& operator << (ostream& os, const T& obj); 其中,os是一个输出流对象,obj是要输出的对象。返回类型为ostream&,这样可以支持链式输出。 通过重载operator <<,我们可以自定义输出对象的格式和内容。例如,对于一个自定义的Person类,我们可以重载operator <<,使得可以通过输出流打印Person对象的姓名和年龄:...
如需詳細資訊,請參閱basic_ostream::operator<<。 樣板函式 C++ 複製 template <class _Elem, class _Tr> basic_ostream<Elem, _Tr>& operator<<( basic_ostream<Elem, _Tr>& _ostr, const Elem *str); 會決定從 str 開始之序列的長度 N =traits_type:: length(str),並插入序列。 如果 N <_...
必须能够使用operator<<命名空间中的ADL找到您的Boost.Log。为此，必须在其参数类型之一的命名空间中定义...
template <class _Elem, class _Tr> basic_ostream<Elem, _Tr>& operator<<( basic_ostream<Elem, _Tr>& _Ostr, Elem _Ch); (在插入 _Ch 之前,无需将其加宽。) 模板函数 C++ 复制 template <class _Tr> basic_ostream<char, _Tr>& operator<<( basic_ostream<char, _Tr>& _Ostr, const sig...
friend std::ostream& operator<<(std::ostream& out, LinkedList& list) { // output something return out; } ... }; 或者在类之外定义它: std::ostream& operator<<(std::ostream& out, LinkedList& list) { // output something return out; } 顺便说一句:我建议您将第二个参数类型 const ...
#include <iostream> #include <iostream> #include <string> class test{ public: test(const std::string _domain,const std::string _interface,const std::string _instance); private: std::string domain_; std::string interface_; std::string instance_; friend std::ostream &operator<<(std::...
operator<<( basic_ostream<char, _Tr>& _Ostr, const unsigned char *_Str ); template<class _Tr> basic_ostream<char, _Tr>& operator<<( basic_ostream<char, _Tr>& _Ostr, unsigned char _Ch ); template<class _Elem, class _Tr, class _Ty> basic_ostream<_Elem, _Tr>& operator<<( ...
operator<<( basic_ostream<char, _Tr>& _Ostr, const unsigned char* str); template <class _Tr> basic_ostream<char, _Tr>& operator<<( basic_ostream<char, _Tr>& _Ostr, unsigned char _Ch); template <class _Elem, class _Tr, class T> basic_ostream <_Elem, _Tr>& operator<<( basic...
(os << "red_t" ); } std::ostream& operator << (std::ostream& os, void(*)(green_t)) { return (os << "green_t"); } std::ostream& operator << (std::ostream& os, void(*)(blue_t )) { return (os << "blue_t" ); } int main( int argc, char **argv ) { std::...