#include <bltTree.h> int Blt_TreeExists(interp, name)
Tcl_Interp   *interp    (in)
    Interpreter to determine current namespace context. 
const char   *name    (in)
    Name of an existing tree data object.  Can be qualified by a namespace. 
This procedure determines if a C-based tree data object exists by a given name. The arguments are as follows:
if (!Blt_TreeExists(interp, "myTree")) {
    fprintf(stderr, "can't find tree \"myTree\\n");
}
Keywords
tree, token Tcl_TreeCreate, Tcl_TreeGetToken, Tcl_TreeReleaseToken