在类头文件中声明字符串数组 - 编译器认为字符串是变量名？
大家好，我需要一些帮助来在 C++ 类头文件中声明字符串数组。
atm 看起来像这样：
//Maze.h
#include <string>
class Maze
{
GLfloat mazeSize, mazeX, mazeY, mazeZ;
string* mazeLayout;
public:
Maze ( );
void render();
};
构造函数看起来像这样：
//Maze.cpp
#include <GL/gl.h>
#include "Maze.h"
#include <iostream>
#include <fstream>
Maze::Maze( )
{
cin >> mazeSize;
mazeLayout = new string[mazeSize];
mazeX = 2/mazeSize;
mazeY = 0.25;
mazeZ = 2/mazeSize;
}
我收到一个编译器错误，上面写着：
In file included from model-view.cpp:11:
Maze.h:14: error: ISO C++ forbids declaration of ‘string’ with no type
Maze.h:14: error: expected ‘;’ before ‘*’ token
对我来说唯一有意义的是，出于某种原因，它认为我希望字符串作为变量名而不是类型声明。
如果有人能帮助我，那就太棒了，我已经查了一段时间了，它让我大吃一惊，哈哈。
干杯，伙计们
Hey everybody, I need a bit of a hand with declaring a string array in my class header file in C++.
atm it looks like this:
//Maze.h
#include <string>
class Maze
{
GLfloat mazeSize, mazeX, mazeY, mazeZ;
string* mazeLayout;
public:
Maze ( );
void render();
};
and the constructor looks like this:
//Maze.cpp
#include <GL/gl.h>
#include "Maze.h"
#include <iostream>
#include <fstream>
Maze::Maze( )
{
cin >> mazeSize;
mazeLayout = new string[mazeSize];
mazeX = 2/mazeSize;
mazeY = 0.25;
mazeZ = 2/mazeSize;
}
I'm getting a compiler error that says:
In file included from model-view.cpp:11:
Maze.h:14: error: ISO C++ forbids declaration of ‘string’ with no type
Maze.h:14: error: expected ‘;’ before ‘*’ token
and the only sense that makes to me is that for some reason it thinks I want string as a variable name not as a type declaration.
If anybody could help me out that would be fantastic, been looking this up for a while and its giving me the shits lol.
Cheers guys
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评论（2）
您需要限定名称：
std::string。除此之外，您的类设计没有正确地分离关注点：类不应该直接询问用户输入。这应该是类构造函数的参数——实际的输入处理应该在类之外。
此外，我希望您正确删除在类析构函数中分配的内存。最好不使用原始指针。请改用
std::vector。这更容易、更安全。You need to qualify the name:
std::string.Apart from that, you class design doesn’t separate concerns properly: the class should not ask user input directly. That should be a parameter to the class constructor – the actual input handling should be outside the class.
Furthermore, I hope you’re properly deleting the memory you allocated in the class destructor. It would be better not to use a raw pointer. Use a
std::vector<std::string>instead. This is much easier and safer.使用 C++ STL SGI。
矢量文档：http://www.sgi.com/tech/stl/Vector.html
字符串文档：http://www.sgi.com/tech/stl /basic_string.html
您可以像普通数组一样访问向量，因为他重载了
[]运算符。但是，如果您可以将 intems 添加到向量中，则必须通过
insert函数来完成，例如：v.insert(v.end(), new_item);。此代码在向量
v的末尾添加一个new_item。您使用
std::vector进行向量声明。Use C++ STL SGI.
Vector documentation: http://www.sgi.com/tech/stl/Vector.html
String documentation: http://www.sgi.com/tech/stl/basic_string.html
You access vector like as normal array because he have overloaded
[] operator.But if you may add intems to a vector you must do it by the
insertfunction, like that:v.insert(v.end(), new_item);.This code add a
new_itemat ends of the vectorv.Vector declaration you doing with
std::vector<std::string>.