bool operator==( const type_info& rhs ) const;
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bool operator!=( const type_info& rhs ) const;
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检查对象是否指代相同类型。
目录 |
rhs | - | 要比较的另一个类型信息对象 |
1) 若二个对象指代相同类型则为 true ,否则为 false
2) 若二个对象指代不同类型则为 true ,否则为 false
#include <iostream> #include <typeinfo> #include <string> #include <utility> class person { public: person(std::string&& n) : _name(n) {} virtual const std::string& name() const{ return _name; } private: std::string _name; }; class employee : public person { public: employee(std::string&& n, std::string&& p) : person(std::move(n)), _profession(std::move(p)) {} const std::string& profession() const { return _profession; } private: std::string _profession; }; void somefunc(const person& p) { if(typeid(employee) == typeid(p)) { std::cout << p.name() << " is an employee "; auto& emp = dynamic_cast<const employee&>(p); std::cout << "who works in " << emp.profession() << '\n'; } } int main() { employee paul("Paul","Economics"); somefunc(paul); }
输出:
Paul is an employee who works in Economics
检查在实现定义的顺序中,被指代类型是否在另一个 type_index 对象之前,即对被指代类型排序 (公开成员函数) |