How to define a function return struct array?

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How to define a function return struct array?

This code can not be complied, why?

struct sTest
{
    int a;       
    int b;         
};

sTest[] add(){
   sTest test[];
   return test;
}
 

  1. use the CODE button (or Alt+S)! (For large amounts of code, attach it.)
          General rules and best pratices of the Forum. - General - MQL5 programming forum #25 (2019)
    I edited it for you this time.

  2. csbinghu: How to define a function return struct array?

    You don't. Perhaps you should read the manual, or press F1 in the editor.
       How To Ask Questions The Smart Way. (2004)
          How To Interpret Answers.
             RTFM and STFW: How To Tell You've Seriously Screwed Up.

    What can be returned: simple types, simple structures, object pointers. With  the return operator you can't return any arrays, class objects, variables of compound structure type.
              Return Operator - Operators - Language Basics - MQL5 Reference - Reference on algorithmic/automated trading language for MetaTrader 5

    Pass the array as a parameter by reference.

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