如何正确使用头文件成为一个完整的类？

Question

(初级程序员..)我正在遵循一个工作正常的头文件的样式,但我想弄清楚我在编译时如何继续得到所有这些错误.我在Cygwin中用g ++编译.

Ingredient.h:8:13: error: expected unqualified-id before ‘)’ token
Ingredient.h:9:25: error: expected ‘)’ before ‘n’
Ingredient.h:19:15: error: declaration of ‘std::string <anonymous class>::name’
Ingredient.h:12:14: error: conflicts with previous declaration ‘std::string<anonymous class>::name()’
Ingredient.h:20:7: error: declaration of ‘int <anonymous class>::quantity’
Ingredient.h:13:6: error: conflicts with previous declaration ‘int<anonymous class>::quantity()’
Ingredient.h: In member function ‘std::string<anonymous class>::name()’:
Ingredient.h:12:30: error: conversion from ‘<unresolved overloaded function type>’ to non-scalar type ‘std::string’ requested
Ingredient.h: In member function ‘int<anonymous class>::quantity()’:
Ingredient.h:13:25: error: argument of type ‘int (<anonymous class>::)()’ does not match ‘int’
Ingredient.h: At global scope:
Ingredient.h:4:18: error: an anonymous struct cannot have function members
Ingredient.h:21:2: error: abstract declarator ‘<anonymous class>’ used as declaration

这是我的类头文件...

#ifndef Ingredient
#define Ingredient

class Ingredient {

public:
  // constructor
    Ingredient() : name(""), quantity(0) {} 
    Ingredient(std::string n, int q) : name(n), quantity(q) {}

  // accessors
    std::string name() { return name; }
    int quantity() {return quantity; }

  // modifier

private:
  // representation
  std::string name;
  int quantity;
};

#endif

我对这些错误感到困惑,并且真的不知道我在做类的实现方面做错了什么.

Answer 1

那是一个有趣的.你基本上是在杀掉你的班级名字#define Ingredient- 所有出现的事件都Ingredient将被删除.这就是为什么包括警卫一般采取的形式#define INGREDIENT_H.

您还使用name了成员和getter函数(可能是尝试翻译C#？).这在C++中是不允许的.