Re: C++ convert large decimal to KDB

[rocuinneagain]

These are examples of using the C interface to extend the Kdb+ database.

 

Documentation is here:

https://code.kx.com/q/interfaces/using-c-functions/

It shows an example of writing a new ‘add’ function in C:

#include"k.h" 
#ifdef __cplusplus extern "C"{ #endif K add(K x,K y) { if(x->t!=-KJ||y->t!=-KJ) 
     return krr("type"); 
     return kj(x->j+y->j); } 
#ifdef __cplusplus } #endif

Then this can be used from inside a Kdb+ process:

q)add:(`add 2:(`add;2)) 
q)add[3;4] 
7

This is a possible method to add math functions for 128-bit floating point numbers inside Kdb+.