摘自c++ FAQ Lite:

The members and base classes of a struct are public by default, while in class, they default to private. Note: you should make your base classes explicitly public, private, or protected, rather than relying on the defaults. struct and class are otherwise functionally equivalent. OK, enough of that squeaky clean techno talk. Emotionally, most developers make a strong distinction between a class and a struct. A struct simply feels like an open pile of bits with very little in the way of encapsulation or functionality. A class feels like a living and responsible member of society with intelligent services, a strong encapsulation barrier, and a well defined interface. Since that's the connotation most people already have, you should probably use the struct keyword if you have a class that has very few methods and has public data (such things do exist in well designed systems!), but otherwise you should probably use the class keyword.

对于c++来说，结构体和类之间并没有太大的区别。主要的功能区别是，结构的成员在默认情况下是公共的，而在类中默认情况下是私有的。否则，就语言而言，它们是等价的。

也就是说，我倾向于在c++中使用结构体，就像我在c#中做的那样，类似于Brian所说的。struct是简单的数据容器，而类用于对象，除了保存数据外，还需要对数据进行操作。

我唯一一次使用结构体而不是类是在函数调用中使用函数子之前声明函数子，为了清晰起见，我想尽量减少语法。例如:

struct Compare { bool operator() { ... } };
std::sort(collection.begin(), collection.end(), Compare()); 

类。

默认情况下，类成员是私有的。

class test_one {
    int main_one();
};

等于

class test_one {
  private:
    int main_one();
};

所以如果你尝试

int two = one.main_one();

我们将得到一个错误:main_one是私有的，因为它不可访问。我们可以 通过指定它的公共ie来初始化它来解决它

class test_one {
  public:
    int main_one();
};

结构体。

struct是一个类，其成员默认为public。

struct test_one {
    int main_one;
};

意味着main_one是私有的，即

class test_one {
  public:
    int main_one;
};

我用struct表示数据结构，其中成员可以取任何值 那样容易些。

我认为Structs是作为一个数据结构(像一个多数据类型的信息数组)和类是为代码打包(像子例程和函数的集合)而设计的。

:(

在用我的主要语言c++编程多年之后，我得出了一个死结论，那就是这是c++的另一个愚蠢的特性。

两者之间没有真正的区别，我也没有理由花额外的时间来决定是应该将实体定义为结构体还是类。

要回答这个问题，请随时将实体定义为结构。默认情况下，成员将是公开的，这是规范。但更重要的是，默认情况下继承将是公开的。受保护继承和更糟糕的私有继承是例外。

我从来没有遇到过私人继承是正确做法的案例。是的，我试图发明问题来使用私有继承，但它不起作用。如果不使用访问器关键字，面向对象编程的角色模型Java默认为公共继承。顺便提一下，Java不允许在继承类上访问关键字，它们只能被公开继承。所以你可以看到，cpp团队在这里真的很失败。

另一件令人沮丧的事情是，如果你定义为类，声明为结构，你会得到编译警告。就好像这是影响程序性能或准确性的东西一样。一个回答还指出，MSVC可能会产生编译器错误。

Those persons that use classes when it is raining and structs when it is shining are doing so based on what they have been taught. It's not something they discovered to be true. Java does not have a pair of names for classes, and only have the class keyword. If you want a data structure, simply make all your members public and don't add functions. This works in Java and I don't see any problem. What's the problem? You need 4 or 5 characters of BOM code to determine how to interpret the context of a class entity.