Thread: Is there a way to point to one structure array entry from another at compile time?

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    Jack of many languages Dino's Avatar
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    Is there a way to point to one structure array entry from another at compile time?

    Here's the scenario.

    I have some structures...

    Code:
    struct entry { 
         char name[8] ;   
         int  age  ;  
    } ; 
    
    struct entry Table1[] = {     // An array of entry's. 
         "Dino"   , 1 , 
         "Bambam" , 2 , 
         "Pebbles", 3 
    } ;  
    
    struct section { 
         struct entry * an_entry ;  
         int  length ;  
         char data[8] ;  
    } 
    
    // I'm struggling with the structure below... 
    
    struct section Table2[] = {   // An array of sections 
        & first entry in Table1  , 5, "abc" ,  
        & second entry in Table1 , 5, "def" ,  
        & third entry in Table1  , 2, "9999"  
    } ;
    Conceptually, I would like to be able to assign a label to each entry of Table1 so that Table2 section.an_entry points to the Table1 entry I want. It's a constant table and does not change at runtime.

    This, obviously isn't legal syntax, but it would look like this

    Code:
     
    struct entry Table1[] = {     // An array of entry's. 
    e1:    "Dino"   , 1 , 
    e2:    "Bambam" , 2 , 
    e3:    "Pebbles", 3 
    } ;  
    
    struct section Table2[] = {   // An array of sections 
        &e1 , 5, "abc" ,  
        &e2 , 5, "def" ,  
        &e3 , 2, "9999"  
    } ;
    Is there a way to do this? I haven't tried to see if it's legal, but if it is, I would rather not code
    Code:
     
    struct section Table2[] = {   // An array of sections 
        &Table1[0] , 5, "abc" ,  
        &Table2[1] , 5, "def" ,  
        &Table1[2] , 2, "9999"  
    } ;
    because Table1 might change in the future, and it might have 50 elements in it. I would prefer a symbolic label or address instead of hardcoding an array subscript (again, if it's even legal).
    Last edited by Dino; 09-01-2022 at 05:56 PM.
    Mainframe assembler programmer by trade. C coder when I can.

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