为什么编译器不能像结构体成员一样为变量声明设置char [] = {..}的大小？ [英] Why the compiler can't set size of char[] = { .. } in a struct member like it does for a variable declaration?

问题描述

我在结构中使用 struct 和初始化的值，如下面的例子。我不能理解的是为什么编译器不能设置大小 char [] = {..} 在一个结构成员像它为一个变量声明？ Clang ++给出以下错误：

I'm using struct with initialized value inside a struct, like below example. What I can't understand is why the compiler can't set size of char[] = { .. } in a struct member like it does for a variable declaration? Clang++ gives the following error:

错误：无法从类初始化器中推导出数组bound

error: array bound cannot be deduced from an in-class initializer

代码：

struct A
{
    char s[]   = { 'F', 'O', 'O', ... };
};

推荐答案

结构元素创建时无法初始化，因为结构定义了一个类型而不是一个可以初始化的变量。您只能在创建结构的对象后初始化结构的变量

Structure elements cannot be initialized while they're created, because the structure defines a type and not a variable which can be initialized. You can only initialize a variable of a structure after creating an object of a structure

例如

struct test
{
    int var;
};

struct test struct_object = { 7 };

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