Help with the "EMPTY_VALUE" in MQL4

 

Guys:

what does the EMPTY_VALUE means in MQL4?

and if it compared with a real number,what is the results?

for example:

result = EMPTY_VALUE > 4

the value of "result" is TRUE or FALSE?

can anyone help?thanks

 
NULL 0 指示空状态的字行。
EMPTY -1 指示空状态的参量。
EMPTY_值 0x7FFFFFFF 指示自定义空值。
CLR_NONE 0xFFFFFFFF 指示空状态的颜色。
WHOLE_ARRAY 0 应用数组功能。指示数组将被处理。
EMPTY_VALUE 一个很大的数,32位整数的最大值