///////////////////////////////////////////////////////////////////////////////
// Name:        wx/msw/ole/dataform.h
// Purpose:     declaration of the wxDataFormat class
// Author:      Vadim Zeitlin
// Modified by:
// Created:     19.10.99 (extracted from msw/ole/dataobj.h)
// Copyright:   (c) 1998 Vadim Zeitlin <zeitlin@dptmaths.ens-cachan.fr>
// Licence:     wxWindows licence
///////////////////////////////////////////////////////////////////////////////
 
#ifndef   _WX_MSW_OLE_DATAFORM_H
#define   _WX_MSW_OLE_DATAFORM_H
 
// ----------------------------------------------------------------------------
// wxDataFormat identifies the single format of data
// ----------------------------------------------------------------------------
 
class WXDLLIMPEXP_CORE wxDataFormat
{
public:
    // the clipboard formats under Win32 are WORD's
    typedef unsigned short NativeFormat;
 
    wxDataFormat(NativeFormat format = wxDF_INVALID) { m_format = format; }
 
    // we need constructors from all string types as implicit conversions to
    // wxString don't apply when we already rely on implicit conversion of a,
    // for example, "char *" string to wxDataFormat, and existing code does it
    wxDataFormat(const wxString& format) { SetId(format); }
    wxDataFormat(const char *format) { SetId(format); }
    wxDataFormat(const wchar_t *format) { SetId(format); }
    wxDataFormat(const wxCStrData& format) { SetId(format); }
 
    wxDataFormat& operator=(NativeFormat format)
        { m_format = format; return *this; }
    wxDataFormat& operator=(const wxDataFormat& format)
        { m_format = format.m_format; return *this; }
 
    // default copy ctor/assignment operators ok
 
    // comparison (must have both versions)
    bool operator==(wxDataFormatId format) const;
    bool operator!=(wxDataFormatId format) const;
    bool operator==(const wxDataFormat& format) const;
    bool operator!=(const wxDataFormat& format) const;
 
    // explicit and implicit conversions to NativeFormat which is one of
    // standard data types (implicit conversion is useful for preserving the
    // compatibility with old code)
    NativeFormat GetFormatId() const { return m_format; }
    operator NativeFormat() const { return m_format; }
 
    // this works with standard as well as custom ids
    void SetType(NativeFormat format) { m_format = format; }
    NativeFormat GetType() const { return m_format; }
 
    // string ids are used for custom types - this SetId() must be used for
    // application-specific formats
    wxString GetId() const;
    void SetId(const wxString& format);
 
    // returns true if the format is one of those defined in wxDataFormatId
    bool IsStandard() const { return m_format > 0 && m_format < wxDF_PRIVATE; }
 
private:
    NativeFormat m_format;
};
 
#endif //  _WX_MSW_OLE_DATAFORM_H

↑ V690 The 'wxDataFormat' class implements the '=' operator, but lacks a copy constructor. It is dangerous to use such a class.