Both code examples compile and run without problems. Using the second variant results in a memory leak. Any ideas why? Thanks in advance for any help.

Variant 1:

typedef boost::shared_ptr<ParameterTabelle> SpParameterTabelle;

struct ParTabSpalteData
{
      ParTabSpalteData(const SpParameterTabelle& tabelle, const string& id)
            :Tabelle(tabelle), Id(id)
      {

      }

      const SpParameterTabelle& Tabelle;
      string Id;
};

Variant 2:

struct ParTabSpalteData
{
      ParTabSpalteData(const SpParameterTabelle& tabelle, const string& id)
            :Id(id)
      {
            // causes memory leak
            Tabelle2 = tabelle;
      }

      SpParameterTabelle Tabelle2;
      string Id;
};