如何正确使用头文件是一个完整的类？(How to properly use a header fil

（初学编程的..）我认为以下的罚款头文件中的风格，但我试图找出我一直在如何让所有这些错误，当我编译。我在Cygwin的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

这里是我的类的头文件...

#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

我对这些错误混淆和真的不知道我做错了关于类的实现..

Answer 1:

这是一个有趣的一个。你被基本杀死你的类名#define Ingredient -中出现的所有Ingredient都将被删除。这就是为什么包括警卫通常采取以下形式#define INGREDIENT_H 。

您还使用name都为会员和getter函数（可能企图翻译C＃？）。这不是在C ++允许。

Answer 2:

如何看的错误？变量和函数不能有相同的名称。而包括后卫永远不应该的名字，如类。

#ifndef INGREDIENT_H
#define INGREDIENT_H

class Ingredient {

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

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

  // modifier

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

#endif