为什么我们不能初始化结构内部成员？ [英] Why can't we initialize members inside a structure?

问题描述

为什么我们不能初始化成员的结构里面？

例如：

 的struct {
   INT I = 10;
};
 

解决方案

如果您要初始化的非静态在结构成员<强>声明

在C ++（不是C），结构几乎是同义类和可以在构造函数初始化成员。

 的struct {
    INT I;    S（）：我（10）
    {
    }
};
 

如果你想初始化的实例

在C或C ++：

 的struct {
    INT I;
};...的struct s_instance = {10};
 

C99也有一个被称为指定初始化功能：

 的struct {
    INT I;
};...的struct s_instance = {
    .I = 10，
};
 

还有一个GNU C扩展，它是非常相似的C99指定的初始值，但最好使用一些更便携的：

 的struct s_instance = {
    I：10，
};
 

Why can't we initialize members inside a structure ?

example:

struct s {
   int i = 10;
};

解决方案

If you want to initialize non-static members in struct declaration:

In C++ (not C), structs are almost synonymous to classes and can have members initialized in the constructor.

struct s {
    int i;

    s(): i(10)
    {
    }
};

If you want to initialize an instance:

In C or C++:

struct s {
    int i;
};

...

struct s s_instance = { 10 };

C99 also has a feature called designated initializers:

struct s {
    int i;
};

...

struct s s_instance = {
    .i = 10,
};

There is also a GNU C extension which is very similar to C99 designated initializers, but it's better to use something more portable:

struct s s_instance = {
    i: 10,
};

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