UTF-16 string terminator

What is the string terminator sequence for a UTF-16 string?

EDIT:

Let me rephras开发者_如何学JAVAe the question in an attempt to clarify. How's does the call to wcslen() work?

Unicode does not define string terminators. Your environment or language does. For instance, C strings use 0x0 as a string terminator, as well as in .NET strings where a separate value in the String class is used to store the length of the string.

To answer your second question, wcslen looks for a terminating L'\0' character. Which as I read it, is any length of 0x00 bytes, depending on the compiler, but will likely be the two-byte sequence 0x00 0x00 if you're using UTF-16 (encoding U+0000, 'NUL')

7.24.4.6.1 The wcslen function (from the Standard)

...

   [#3]   The  wcslen  function  returns  the  number  of  wide
   characters that precede the terminating null wide character.

And the null wide character is L'\0'

There isn't any. String terminators are not part of an encoding.

For example if you had the string ab it would be encoded in UTF-16 with the following sequence of bytes: 61 00 62 00. And if you had 大家 you would get 27-59-B6-5B. So as you can see no predetermined terminator sequence.