std::type_info::operators
性病：：类型[医]信息：：Operator==，std：：type[医]信息：：操作员%21=
| bool operator==( const type_info& rhs ) const; | | |
|---|---|---|
| bool operator!=( const type_info& rhs ) const; | | |
检查对象是否引用相同的类型。
参数
| rhs | - | another type information object to compare to |
|---|
返回值
true如果比较操作成立，false否则。
例
二次
#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
}
二次
产出：
二次
Paul is an employee who works in Economics
二次
另见
| before | checks whether the referred type precedes referred type of another type_index object in the implementation defined order, i.e. orders the referred types (public member function) |
|---|
© cppreference.com
在CreativeCommonsAttribution下授权-ShareAlike未移植许可v3.0。
