当你用code块？ [英] When do you use code blocks?

问题描述

当你使用C / C ++ / C＃等code块？我知道他们背后的理论理性，但是当你使用它们在实际程序？

When do you use code blocks in C/C++/C#, etc.? I know the theoretical reason behind them, but when do you use them in real programs?

修改：我刚才已经意识到，我使用它们开关语句，其中的变量，否则将在同一范围（GRR的东西如我）：

EDIT: I have just realised that I use them in switch statements, where variables would otherwise be in the same scope (grr for things like i):

switch (x) { case "abc": { /* code */ } break; }

等 （只是为了澄清，在switch语句中，额外的括号的不是的要求。）

etc (Just to clarify, in a switch statement, the extra braces are NOT required.)

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相关报道：

• 你使用大括号额外的范围界定？ （<一href="http://stackoverflow.com/questions/249009/do-you-use-curly-braces-for-additional-scoping">http://stackoverflow.com/questions/249009/do-you-use-curly-braces-for-additional-scoping)

推荐答案

我有时候会，但很少使用明火code块限制范围。例如，采取以下code：

I sometimes, but rarely, use naked code blocks to limit scope. For example, take the following code:

double bedroomTemperature = ReadTemperature(Room.Bedroom);
database.Store(Room.Bedroom, bedroomTemperature);

double bathroomTemperature = ReadTemperature(Room.Bathroom);
database.Store(Room.Bedroom, bedroomTemperature);

在code看起来很好，乍看之下，却蕴含着微妙的复制面食错误。在数据库已储存的卧室温度两个读数。如果它已被写为：

The code looks fine at first glance, but contains a subtle copy-pasta error. In the database we have stored the bedroom temperature for both readings. If it had been written as:

{
    double bedroomTemperature = ReadTemperature(Room.Bedroom);
    database.Store(Room.Bedroom, bedroomTemperature);
}

{
    double bathroomTemperature = ReadTemperature(Room.Bathroom);
    database.Store(Room.Bedroom, bedroomTemperature);
}

那么编译器（甚至是IDE，如果它有足够的智能）会看准了这一点。

Then the compiler (or even IDE if it is intelligent enough) would have spotted this.

然而，90％的code，可重构，使裸体阻止不必要的时间，例如：上述code会更好写成循环或两次调用读取并存储该温度的方法：

However, 90% of the time the code can be refactored to make the naked blocks unnecessary, e.g. the above code would be better written as a loop or two calls to a method that reads and stores the temperature:

foreach (Room room in [] { Room.Bedroom, Room.Bathroom })
{
    double temperature = ReadTemperature(room);
    database.Store(room, temperature);
}

裸体块是偶尔有用，但。

Naked blocks are useful on occasion though.

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