NL.7: Make the length of a name roughly proportional to the length of its scope
NL.7：使名称的长度与作用域的大小大致成比例
Rationale: The larger the scope the greater the chance of confusion and of an unintended name clash.
原理：范围越大，混淆和意外的名称冲突的机会就越大。
Example（示例）
代码语言：javascript复制double sqrt(double x); // return the square root of x; x must be non-negative
int length(const char* p); // return the number of characters in a zero-terminated C-style string
int length_of_string(const char zero_terminated_array_of_char[]) // bad: verbose
int g; // bad: global variable with a cryptic name
int open; // bad: global variable with a short, popular name
The use of p for pointer and x for a floating-point variable is conventional and non-confusing in a restricted scope.
将p用于指针，将x用于浮点变量是常规的，并且在限定范围内不会混淆。
Enforcement（实施建议）
原文链接
https://github.com/isocpp/CppCoreGuidelines/blob/master/CppCoreGuidelines.md#nl7-make-the-length-of-a-name-roughly-proportional-to-the-length-of-its-scope
