Question

I’ve been using Crypto++ with VS2005 and VS2010 for a while now. But recently I needed to use it with and application directly. The same code compiles fine when I’m compiling as a DLL and does not compile when compiling as an application.

This is the smallest sample that reproduces the error is this (based on cryptopp561\algparam.h:301 CryptoPP::AlgorithmParametersTemplate

class Base 
{
protected:
    virtual void MoveInto(void *p) const = 0;
};

template<class T>
class Test: public Base
{
public:
    void MoveInto(void * buffer) const
    {
        Test<T> *x = new(buffer) Test<T>(*this);
    }
};

extern template class Test<bool>;

The compilation parameters are the same, only difference that I saw was the configuration type in the project (“Application (.exe)” generates the error and “Dynamic Library (.dll)” does not).

This is the compiler error:

main.h(15): error C2061: syntax error : identifier 'buffer'
      main.h(14) : while compiling class template member function 'void Test<T>::MoveInto(void *) const'
      with
      [
          T=bool
      ]
      main.h(20) : see reference to class template instantiation 'Test<T>' being compiled
      with
      [
          T=bool
      ]

It seems to occur only when theres inheritance. Ommiting : public Base in the class Test declaration makes the error go away.

EDIT:
The problem was in a header included somewhere that defined a a debug version for operator new but didn’t declared the placement new version.

Answer 1

Did you #include <new>, the header file that declares placement-new?