C++ 模板 - 错误：“<”标记之前的预期初始值设定项
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C++ template - error: expected initializer before '<' token
提问by DukeOfMarmalade
I am trying to learn about templates, I want my class pair to be able to hold two objects of any type. I just want to provide an accessor function for obj1 now. But I get the following error when I try to complile:
我正在尝试了解模板，我希望我的类对能够容纳任何类型的两个对象。我现在只想为 obj1 提供一个访问器函数。但是当我尝试编译时出现以下错误：
error: expected initializer before '<' token
T1 pair<T1,T2>::getObj1()
My code is:
我的代码是：
#include <iostream>
#include <stdio.h>
#include <string.h>
using namespace std;
template <class T1, class T2>
class pair
{
public:
pair(const T1& t1, const T2& t2) : obj1(t1), obj2(t2){};
T1 getObj1();
private:
T1 obj1;
T2 obj2;
};
template <class T1, class T2>
T1 pair<T1,T2>::getObj1()
{
return obj1;
}
int main()
{
return 0;
}
回答by Davidbrcz
pair is name of a standard class and with the using namespace std, there is a collision.
pair 是标准类的名称，与using namespace std存在冲突。
Several solutions :
几种解决方案：
- Rename your class to something else.
- Dont use the using statement
- 将您的班级重命名为其他名称。
- 不要使用 using 语句
