set和record数据类型的区别

TTCN-3 supports ordered structured types known as record. The elements of a record type may be any of the basic types or user-defined data types (such as other records, sets or arrays).

 

type record MyRecordType
{
    integer field1,
    MyOtherRecordType field2 optional,
    charstring field3
}

 

TTCN-3 supports unordered structured types known as set. Set types and values are similar to records except that the
ordering of the set fields is not significant.
  
type set MySetType
{
    integer field1,
    charstring field2
}

 

record定义的数据类型，是具有一定顺序的，而使用set定义的数据类型是没有顺序的。

一般情况下，没有本质区别，但是在数据结构赋值的时候，那么set的类型就非常方便了。

record定义的数据类型，就如同类的构造函数一样（在构造函数中，每个成员的初始化都必须和类声明中成员的声明顺序一致）。