本文介绍了C++11中新增的auto关键字的基本用法及其限制条件。auto可以用于推导变量类型，简化代码书写，但在函数参数、返回类型及多类型初始化等方面存在使用限制。
• auto is used to infer the type of the variable that is being declared and initialized
• In ‘old’ C++:
• In C++ 11:
• Anyway,there are restrictions on its usage:
• You cannot use auto as a type of an argument of a function or method.
• Your method return type cannot be auto
• You cannot use auto to declare and initialize variables of several types in the same line, like this:
autox = 2, b = true, c = "hello"; //invalid auto usage
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