forgot this file

resize-example.cc

@@ -0,0 +1,82 @@
+#include "lmdb-safe.hh"
+#include <string.h>
+using namespace std;
+
+int main(int argc, char** argv)
+{
+  auto env = getMDBEnv("resize",  MDB_NOSUBDIR | MDB_NOSYNC, 0600);
+  auto main = env->openDB("ahu",  MDB_CREATE );
+
+  MDBInVal key("counter");
+
+  auto rwtxn = env->getRWTransaction();
+  rwtxn.put(main, "counter", "1234");
+  rwtxn.put(main, MDBInVal::fromStruct(std::make_pair(12,13)), "hoi dan 12,13");
+
+  rwtxn.put(main, MDBInVal::fromStruct(std::make_pair(14,15)),
+            MDBInVal::fromStruct(std::make_pair(20,23)));
+
+  
+  MDBOutVal out;
+  if(!rwtxn.get(main, MDBInVal::fromStruct(std::make_pair(12,13)), out)) 
+    cout << "Got: " << out.get<string_view>() << endl;
+  else
+    cout << "Got nothing!1"<<endl;
+  
+  if(!rwtxn.get(main, MDBInVal::fromStruct(std::make_pair(14,15)), out)) {
+    auto res = out.get_struct<pair<int,int>>();
+    cout << "Got: " << res.first<<", "<<res.second << endl;
+  }
+  else
+    cout << "Got nothing!1"<<endl;
+
+  rwtxn.put(main, 12.12, 7.3);
+  if(!rwtxn.get(main, 12.12, out)) {
+    cout<<"Got: "<< out.get<double>() <<endl;
+  }
+  else
+    cout << "Got nothing!1"<<endl;
+
+  
+  rwtxn.commit();
+  return 0;
+  
+  if(argc==1) {
+    for(;;) {
+      auto rotxn = env->getROTransaction();
+      MDBOutVal data;
+      if(!rotxn.get(main, key, data))  {
+        cout<<"Counter is "<<data.get<unsigned int>() << endl;
+        cout <<data.get<string>() << endl;
+        cout<<data.get<string_view>() << endl;
+
+        struct Bert
+        {
+          uint16_t x,y;
+        };
+        auto b = data.get_struct<Bert>();
+        cout<<b.x<<" "<<b.y<<endl;
+        cout<<data.get<unsigned long>() << endl;
+      }
+      else
+        cout<<"Didn't find it"<<endl;
+      exit(1);
+    }
+  }
+  else {
+    size_t size = 1ULL*4096*244140ULL;
+    for(unsigned int n=0;;++n) {
+      if(!(n%16384)) {
+        size += 16384;
+        if(int rc=mdb_env_set_mapsize(*env.get(), size))
+          throw std::runtime_error("Resizing: "+string(mdb_strerror(rc)));
+        cout<<"Did resize"<<endl;
+      }
+      auto txn = env->getRWTransaction();
+      txn.put(main, key, MDBInVal(n));
+      for(int k=0; k < 100; ++k)
+        txn.put(main, MDBInVal(n+1000*k), MDBInVal(n+1000*k));
+      txn.commit();
+    }
+  }
+}