C ++：从指针到类访问成员struct的语法 | 从指针到类访问成员struct的语法

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问题描述

我试图访问一个成员structs变量，但我似乎无法得到正确的语法。
两个编译错误。访问是：
错误C2274：'function-style cast'：非法作为'。'的右边
错误C2228：.otherdata的左边必须有类/ struct / union
我尝试了各种更改，但没有成功。

I'm trying to access a member structs variables, but I can't seem to get the syntax right.The two compile errors pr. access are:error C2274: 'function-style cast' : illegal as right side of '.' operatorerror C2228: left of '.otherdata' must have class/struct/unionI have tried various changes, but none successful.

#include <iostream>

using std::cout;

class Foo{
public:
    struct Bar{
    	int otherdata;
    };
    int somedata;
};

int main(){
    Foo foo;
    foo.Bar.otherdata = 5;

    cout << foo.Bar.otherdata;

    return 0;
}

推荐答案

，不分配一个。尝试这样：

You only define a struct there, not allocate one. Try this:

class Foo{
public:
    struct Bar{
        int otherdata;
    } mybar;
    int somedata;
};

int main(){
    Foo foo;
    foo.mybar.otherdata = 5;

    cout << foo.mybar.otherdata;

    return 0;
}

如果要在其他类中重用struct， struct outside：

If you want to reuse the struct in other classes, you can also define the struct outside:

struct Bar {
  int otherdata;
};

class Foo {
public:
    Bar mybar;
    int somedata;
}

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