本文探讨了编译过程中记录表达式的内部表示方法，即将记录转换为元组形式，并介绍了如何通过伪函数获取记录信息，如字段数量及大小。
8.7 Internal Representation of Records
Record expressions are translated to tuple expressions during compilation. A record defined as
-record(Name, {Field1,...,FieldN}).
is internally represented by the tuple
{Name,Value1,...,ValueN}
where each ValueI is the default value for FieldI.
[color=red]
To each module using records, a pseudo function is added during compilation to obtain information about records:
record_info(fields, Record) -> [Field]
record_info(size, Record) -> Size
Size is the size of the tuple representation, that is one more than the number of fields.
[/color]
Record expressions are translated to tuple expressions during compilation. A record defined as
-record(Name, {Field1,...,FieldN}).
is internally represented by the tuple
{Name,Value1,...,ValueN}
where each ValueI is the default value for FieldI.
[color=red]
To each module using records, a pseudo function is added during compilation to obtain information about records:
record_info(fields, Record) -> [Field]
record_info(size, Record) -> Size
Size is the size of the tuple representation, that is one more than the number of fields.
[/color]
扫一扫
3207
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
