C ++错误C2533，ctor：构造函数不允许返回类型[关闭]

Question

我有一个班级叫老师

 class Teacher
{
private:
    int ID;
    string qualification;
    double salary;
    Date DOB;
    Date dateJoined;
public:
    Teacher();
    void setTeacher (int, string, double);
    string getQualification();
    void displayTeacher();
}
//This is my constructor
Teacher::Teacher()
{
     ID = 0;
     qualification =" " ;
     salary=0.0;
}

我收到错误 C2533：'Teacher::{ctor}'：构造函数不允许返回类型。 我哪里做错了？

Answer 1

您没有在类定义后放置分号。

这会使解析器感到困惑，它现在认为您正在编写如下内容：

 class {}     functionName(args) {}
 ^^^^^^^^     ^^^^^^^^^^^^
return type   constructors
 defined     are functions, but
 in-place     they don't have
  (oops)       return types!
                 (oops)

现代 GCC（比如 4.9.2）非常清楚这个问题：

class Teacher
{
    Teacher();
}

Teacher::Teacher()
{}

// main.cpp:3:1: error: new types may not be defined in a return type
//  class Teacher
//  ^
// main.cpp:3:1: note: (perhaps a semicolon is missing after the definition of 'Teacher')
// main.cpp:8:18: error: return type specification for constructor invalid
//  Teacher::Teacher()
//                  ^

(live demo)