undefined function jv

Community Support
1

hi,
   I use jv function to join a K list to another k object. but vs shows error message:

Error15error LNK2019: unresolved external symbol _jv referenced in function “public: void __thiscall qcpp::QCplusplus::publish(class KdbData,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)” (?publish@QCplusplus@qcpp@@QAEXVKdbData@@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z)

  Who can tell me how to solve this prolbem?

2

unfortunately jv is not available on the windows builds.

As a workaround, you can use jk for appending each element.

3

Thanks you very much.

? 2015?11?23??? UTC+8??6:02:00?Charles Skelton???

unfortunately jv is not available on the windows builds.

As a workaround, you can use jk for appending each element.

4

So, I can use jk to join a list to another list on windows,right?

? 2015?11?23??? UTC+8??6:02:00?Charles Skelton???

unfortunately jv is not available on the windows builds.

As a workaround, you can use jk for appending each element.

5

yes, as in

  K f(){

    J i;
    K x=knk(2,ki(42),ks(“hello”));
    K y=knk(3,kf(3.142),kp(“world”),ki(0));
    for(i=0;i<y->n;i++)
      jk(&x,r1(kK(y)[i]));

    r0(y);

    return x;
  }

6

or if you are writing your code loaded as a shared library into kdb+

 K z=k(0,“,”,x,y,(K)0);

7

I’m interested in why jv isn’t available on windows. It could be defined as:

K jv(Kx,K y){DO(y->n,jk(x,r1(kK(y)[i]))r0(y);Rx;} /untested

From http://code.kx.com/wiki/Cookbook/InterfacingWithC#Creating_lists:

K more=ktn(KS,2);kS(more)[0]=ss("INTC");kS(more)[1]=ss("GOOG");jv(&syms,more); // append a vector with two symbols to syms
8

just an oversight with exports. Future releases will have jv exported. The builtin jv is more efficient than itemwise copy.