Re: Is it possible to add items to the arrays and hashes at compile time?

[Dennis Ritchie via Digitalmars-d-learn]

On Sunday, 7 June 2015 at 15:20:17 UTC, Ali Çehreli wrote:
/* Some function that generates an AA */

Thanks. Beautiful code, but I want a little more :)

/* Some function that generates an AA */
int[][int][int] initHash(int i)
{
	/* It is nice to see that this function is not called at run 
time */
        if (!__ctfe) {
                import std.stdio;
                writefln("%s is called at run time", __FUNCTION__);
        }
        
        return [i : [ i : [i, i] ] ];
}

/* Question: Is there a function to merge two AAs? */
int[][int][int] merge(Hash)(Hash[] hashes...)
{
	/* It is nice to see that this function is not called at run 
time */
        if (!__ctfe) {
                import std.stdio;
                writefln("%s is called at run time", __FUNCTION__);
        }
        
        int[][int][int] result;
        
        foreach (hash; hashes) {
                foreach (key, value; hash) {
                        result[key] = value;
                }
        }
        
        return result;
}

/* These three are generated at compile time */
enum firstPart = initHash(1);
enum secondPart = initHash(2);
enum int[][int][int] ctHash = merge(firstPart, secondPart);

void main()
{
        import std.stdio;

        static if (!(4 in ctHash)) {{
                // ...
        }}

        ctHash[4][4] ~= [4, 4]; // I want this to work at compile time :)
        // Possible?

        static if (!!(4 in ctHash)) {{
                // ...
        }}
}