tuple_is_stringtuple_is_stringTupleIsStringTupleIsStringtuple_is_string (算子)

名称

tuple_is_stringtuple_is_stringTupleIsStringTupleIsStringtuple_is_string — Test if the internal representation of a tuple is of type string.

签名

tuple_is_string( : : T : IsString)

描述

tuple_is_stringtuple_is_stringTupleIsStringTupleIsStringTupleIsStringtuple_is_string tests if the internal representation of the input tuple TTTTtt is of type string. In that case the value 1 (true) is returned in IsStringIsStringIsStringIsStringisStringis_string, otherwise the value 0 (false) is returned. If a tuple consists of string elements only, IsStringIsStringIsStringIsStringisStringis_string can nevertheless be 0 in case the internal representation is H_TYPE_MIXED; see tuple_typetuple_typeTupleTypeTupleTypeTupleTypetuple_type for details.

例外：空输入元组

If the input tuple is empty, the operator returns 1.

HDevelop 内联操作

HDevelop provides an in-line operation for tuple_is_stringtuple_is_stringTupleIsStringTupleIsStringTupleIsStringtuple_is_string, which can be used in an expression in the following syntax:

IsString := is_string(T)

注意

Even if all tuple elements are of type string, tuple_is_stringtuple_is_stringTupleIsStringTupleIsStringTupleIsStringtuple_is_string returns 0 (false) if the internal representation of the tuple is of type H_TYPE_MIXED. To test if the elements of the tuple are of type string the operator tuple_is_string_elemtuple_is_string_elemTupleIsStringElemTupleIsStringElemTupleIsStringElemtuple_is_string_elem should be used.

执行信息

多线程类型：独立（即使使用独占算子也能并行运行）。
多线程作用域：全局（可从任何线程调用）。
未采用并行化处理。

参数

TTTTtt (输入控制) tuple(-array) → (string / real / integer / handle)

Input tuple.

IsStringIsStringIsStringIsStringisStringis_string (输出控制) number → (integer)

Is the input tuple of type string?

示例（HDevelop）

tuple_is_string ([3.1416,'pi',3], IsStringA)
* IsStringA = false
tuple_is_string (['a','b','111'], IsStringB)
* IsStringB = true
tuple_is_string ([], IsStringC)
* IsStringC = true

结果

如果参数有效，算子 tuple_is_stringtuple_is_stringTupleIsStringTupleIsStringTupleIsStringtuple_is_string 返回值 2 ( H_MSG_TRUE )。

替代

tuple_typetuple_typeTupleTypeTupleTypeTupleTypetuple_type, tuple_is_numbertuple_is_numberTupleIsNumberTupleIsNumberTupleIsNumbertuple_is_number, tuple_is_string_elemtuple_is_string_elemTupleIsStringElemTupleIsStringElemTupleIsStringElemtuple_is_string_elem

另见

tuple_is_inttuple_is_intTupleIsIntTupleIsIntTupleIsInttuple_is_int, tuple_is_realtuple_is_realTupleIsRealTupleIsRealTupleIsRealtuple_is_real, tuple_is_handletuple_is_handleTupleIsHandleTupleIsHandleTupleIsHandletuple_is_handle

模块

基础

算子