// lazy constaint callback int callback (CPXCENVptr env, void *cbdata, int wherefrom, void *cbhandle, int *useraction_p) { int status; CPXLPptr lp = malloc(0); status = CPXgetcallbacknodelp (env, cbdata, wherefrom, &lp); fprintf(stdout,"lazy: "); // char s[50]; // sprintf(s,"%f", objval); // printf("%s\n", s); double x[3]; CPXgetcallbacknodex (env, cbdata, wherefrom, x, 0, 3-1); printf("\n"); for(int i = 0; i < 3; i++) { char xs[10]; sprintf(xs,"%f, ", x[i]); printf("%s", xs); } printf("\n"); // if(x[0] > 20) // { // x[0]--; // *isfeas_p = 0; // } int cmatbeg[1] = {0}; int cmatind[3] = {0,1,2}; double cmatval[3] = {0,1,0}; char csense[1] = {'L'}; double crhs[1] = {20}; // CPXaddusercuts doesnt work for some f*****g reason if(x[2] > 20) { //*isfeas_p = 0; //status = CPXaddlazyconstraints(env, lp, 1, 3, crhs, csense, cmatbeg, cmatind, cmatval, NULL ); status = CPXcutcallbackadd(env, cbdata, wherefrom, 3, 20, 'L', cmatind, cmatval, CPX_USECUT_FORCE); } // if ( status ) { fprintf (stderr, "Some f*****g error, status = %d.\n", status); } //*useraction_p = CPX_CALLBACK_SET; return 0; }
int CPXPUBLIC CPX_CutCallback(CPXCENVptr xenv, void *cbdata, int wherefrom, void *cbhandle, int *useraction_p) { // cout << "Entering CPX Callback\n" << flush; CPXLPptr nodelp; CPXgetcallbacknodelp(xenv, cbdata, wherefrom, &nodelp); CoinCallbacks* ccc = (CoinCallbacks*)cbhandle; int length = CPXgetnumcols(xenv,nodelp) - 1; //hey, don't ask me! some VERY WIERD PHENOMENON... crap double objVal; double* solution = new double[length]; CPXgetcallbacknodeobjval(xenv, cbdata, wherefrom, &objVal); CPXgetcallbacknodex(xenv, cbdata, wherefrom, solution, 0, length-1); OsiCuts* cuts = new OsiCuts(); CoinCallbacks::CutReturn ret = ccc->cutCallback(objVal, solution, cuts); if(ret == CoinCallbacks::CR_AddCuts) { for(int i = cuts->sizeRowCuts(); i-->0;) { const OsiRowCut& c = cuts->rowCut(i); const CoinPackedVector& vec = c.row(); if(c.globallyValid()) /* Old Cplex-Versions did NOT have the last parameter (now set to "false"). * If you compile agains an older CPLEX version, simple *REMOVE* * ", false" * from the calls to CPXcutscallbackadd */ CPXcutcallbackadd(xenv, cbdata, wherefrom, vec.getNumElements(), c.rhs(), c.sense(), vec.getIndices(), vec.getElements(), false); //default to non-purgable cuts else CPXcutcallbackaddlocal(xenv, cbdata, wherefrom, vec.getNumElements(), c.rhs(), c.sense(), vec.getIndices(), vec.getElements()); cuts->eraseRowCut(i); } if(cuts->sizeColCuts() > 0) { cerr << "ColCuts currently not supported...\n"; OGDF_THROW_PARAM(LibraryNotSupportedException, lnscFunctionNotImplemented); } } *useraction_p = ( ret == CoinCallbacks::CR_Error) ? CPX_CALLBACK_FAIL : ( ret == CoinCallbacks::CR_AddCuts ) ? CPX_CALLBACK_SET : CPX_CALLBACK_DEFAULT; delete cuts; delete[] solution; // cout << "Leaving CPX Callback\n" << flush; return 0; // success }