std :: shared_ptr..unable解析标识符 [英] std::shared_ptr..unable to resolve identifier

问题描述

我正在尝试使用c ++中的智能指针。我已经包含< memory>我的代码中的头文件，但我的代码在行上给我错误说无法解析标识符



std :: shared_ptr< person> p（新人（Scott，25））;



其中Person是我在我的代码中创建的类。



请有人帮忙.. ??

解决方案

Quote：

std :: shared_ptr p（新人（Scott，25））;

应该是

< pre lang =C ++> std :: shared_ptr< Person> p（ new Person（ Scott ， 25 ））;

不应该吗？





以下代码编译（并运行）正常（ Visual C ++ Express 2010 ）：

  #include   <  内存 >  
   #include   <   iostream  >  
   class 人
 {
  int  age; 
  const   char  * name; 
  public ：
 Person（ const   char  * name， int  age）：name（name），age（age）{} 
  void  show（）{std :: cout<<名称<<  <<年龄<< std :: endl;} 
}; 
 
 
  int  main（）
 {
 std :: shared_ptr< Person> p（ new  Person（  Scott ， 25 ））; 
 p-> show（）; 
} 

std :: shared_ptr是C ++ 11的补充。 （这是在2007年发布的技术报告1中.VC ++ 2010将它包含在< memory>中，因为众所周知它会成为标准的一部分，但严格来说它应该留在tr1名称空间中。）



如果您的编译器不支持C ++ 11，您可以尝试使用：

< br /> 
 #include< tr1 / memory>< br /> 
 ...< br /> 
 std :: tr1 :: shared_ptr< Person& gr; p（新人（Scott，25））;< br /> 

否则，您可以从添加库，它是在C ++ 11中包含它之前开发和测试的。

I am trying my hands on the smart pointers in c++. I have included <memory> header file in my code but my code is giving me error saying "unable to resolve identifier" on the line

std::shared_ptr<person> p(new Person("Scott", 25));

Where Person is a class that i have created in my code.

Please can anyone help..??

解决方案

Quote:

std::shared_ptr p(new Person("Scott", 25));

It should be

std::shared_ptr<Person> p(new Person("Scott", 25));

shouldn''t it?


The following code compiles (and runs) fine (Visual C++ Express 2010):

#include <memory>
#include <iostream>
class Person
{
  int age;
  const char * name;
public:
  Person(const char * name, int age):name(name), age(age){}
    void show(){std::cout << name << " " << age << std::endl;}
};


int main()
{
  std::shared_ptr<Person> p(new Person("Scott", 25));
    p->show();
}

std::shared_ptr is a C++11 addition. (It was in Technical Report 1, published in 2007. VC++ 2010 included it in <memory> since it was well known it would become part of the standard, but strictly speaking it should have been left in the tr1 namespace.)

If your compiler doesn''t support C++11, you could try to use:

<br />
#include <tr1/memory><br />
...<br />
std::tr1::shared_ptr<Person&gr; p(new Person("Scott", 25));<br />

Otherwise, you can get it from the Boost libraries, which is where it was developed and tested before it''s inclusion in C++11.

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