Start trying to write a c++ interface. Addresses #197.

git-svn-id: file:///svn/tokudb@1175 c7de825b-a66e-492c-adef-691d508d4ae1

cxx/Makefile

+CPPFLAGS = -I../include
+test1: test1.o dbt.o

cxx/db_cxx.h

+#include <db.h>
+#include <string.h>
+
+class Dbt;
+
+// DBT and Dbt objects are interchangeable.  So watch out if you use Dbt to make other classes (e.g., with subclassing)
+class Dbt : private DBT
+{
+ public:
+
+    void *    get_data(void) const     { return data; }
+    void      set_data(void *p)        { data = p; }
+    
+    u_int32_t get_size(void) const     { return size; }
+    void      set_size(u_int32_t  p)   { size =  p; }
+		       
+    DBT *get_DBT(void)                 { return (DBT*)this; }
+
+    Dbt(void);
+    ~Dbt();
+
+ private:
+    // Nothing here.
+}
+;
+

cxx/dbt.cpp

+#include "db_cxx.h"
+
+Dbt::Dbt(void) {
+    DBT *dbt = this;
+    memset(dbt, 0, sizeof(*dbt));
+}

cxx/test1.cpp

+#include <db_cxx.h>
+
+
+#include <iostream>
+using namespace std;
+int main()
+{
+    Dbt dbt;
+    dbt.set_size(3);
+    cout << "Hello World!" << endl;   cout << "Welcome to C++ Programming" << endl;
+    return 0;
+}