More fiddling around with c++. Addresses #197.

git-svn-id: file:///svn/tokudb@1177 c7de825b-a66e-492c-adef-691d508d4ae1

cxx/Makefile

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

cxx/db.cpp

+#include "db_cxx.h"
+
+Db::~Db() {
+    if (!the_db) {
+	the_db->close(db, 0);
+	the_db->toku_internal = 0;
+	// Do we need to clean up "private environments"?
+    }
+}
+
+int DB::close (u_int32_t flags) {
+    if (!the_db) {
+	return EINVAL;
+    }
+    int ret = the_db->close(flags);
+
+    the_db->toku_internal = 0;
+    // Do we need to clean up "private environments"?
+
+    return ret;
+}

cxx/db_cxx.h

@@ -21,6 +21,39 @@ class Dbt : private DBT
 
  private:
     // Nothing here.
-}
-;
+};
 
+class Db {
+ public:
+    /* Functions to make C++ work, defined in the BDB C++ API documents */
+    Db(DbEnv *dbenv, u_int32_t flags);
+    ~Db();
+
+    DB *Db::get_DB(void) {
+	return the_db;
+    }
+    const DB *Db::get_const_DB() const {
+	return the_db;
+    }
+    static Db *Db::get_Db(DB *db) {
+	return (Db*)db->toku_internal;
+    }
+    static const Db *Db::get_const_Db(const DB *db) {
+	return (Db*)db->toku_internal;
+    }
+
+    /* C++ analogues of the C functions. */
+    int close(u_int32_t /*flags*/);
+    int cursor(DbTxn */*txnid*/, Dbc **/*cursorp*/, u_int32_t /*flags*/);
+    int del(DbTxn */*txnid*/, Dbt */*key*/, u_int32_t /*flags*/);
+    int get(DbTxn */*txnid*/, Dbt */*key*/, Dbt */*data*/, u_int32_t /*flags*/);
+    int open(DbTxn */*txnid*/, const char */*name*/, const char */*subname*/, DBTYPE, u_int32_t, int);
+    int put(DbTxn *, Dbt *, Dbt *, u_int32_t);
+    int get_flags(u_int32_t *);
+    int set_flags(u_int32_t);
+
+
+ private:
+    DB *the_db;
+	
+};