visibility variable

This article mainly discusses variable life span, scope, visibility, named space, method for quoting named space members, alia name etc. in C~++ system.

变量的命名空间是解决在同一作用域内同名成员引用的方法。主要讨论了C++系统中变量的生存期、作用域、可见性，命名空间、命名空间成员的引用方法和命名空间的别名等问题。

In other words, this means that the old memory model made promises only about the visibility of the variable being read or written, and no promises about the visibility of writes to other variables.

换句话说，这意味着老的内存模型只保证正在读或写的变量的可见性，不保证写入其他变量的可见性。

The declaration of a field (member variable) can be prefixed with keywords indicating the visibility, just as in languages like Java and C#.

字段（成员变量）的声明可以用可见程度关键字来做前缀，就像Java和C#这样的语言一样。