C ++ - 在一行中定义多个对象指针导致编译器错误 [英] C++ - Declaring multiple object pointers on one line causes compiler error

问题描述

当我这样做（在我的课）

when I do this (in my class)

public:
    Entity()
    {
        re_sprite_eyes = new sf::Sprite();
        re_sprite_hair = new sf::Sprite();
        re_sprite_body = new sf::Sprite();
    }

private:
    sf::Sprite* re_sprite_hair;
    sf::Sprite* re_sprite_body;
    sf::Sprite* re_sprite_eyes;

一切工作正常。但是，如果我改变了声明如下：

Everything works fine. However, if I change the declarations to this:

private:
    sf::Sprite* re_sprite_hair, re_sprite_body, re_sprite_eyes;

我得到这个编译器错误：

I get this compiler error:

error: no match for 'operator=' in '((Entity*)this)->Entity::re_sprite_eyes = (operator new(272u), (<statement>, ((sf::Sprite*)<anonymous>)))

，然后它说对考生 re_sprite_eyes 是 SF ::雪碧的对象和/或引用。

为什么这个不工作？不声明一样呢？

Why does this not work? Aren't the declarations the same?

推荐答案

SF ::雪碧* re_sprite_hair，re_sprite_body，re_sprite_eyes;

不声明三分球 - 这是一家指针和2对象

Does not declare 3 pointers - it is one pointer and 2 objects.

SF ::雪碧* 遗憾的是并不适用于声明的所有变量以下，只是第一个。它相当于

sf::Sprite* unfortunately does not apply to all the variables declared following it, just the first. It is equivalent to

sf::Sprite* re_sprite_hair;
sf::Sprite re_sprite_body;
sf::Sprite re_sprite_eyes;

您想要做的：

SF ::雪碧* re_sprite_hair，* re_sprite_body，* re_sprite_eyes;

您需要把一星为每个变量。在这种情况下，我preFER保持对变量的身边的明星，而不是类型，使正是这种情况清楚了。

You need to put one star for each variable. In such cases I prefer to keep the star on the variable's side, rather than the type, to make exactly this situation clear.

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