1.1 --- a/lemon/glpk.h	Fri Feb 12 22:24:26 2010 +0100
     1.2 +++ b/lemon/glpk.h	Sun Feb 14 23:14:09 2010 +0100
     1.3 @@ -25,16 +25,28 @@
     1.4  
     1.5  #include <lemon/lp_base.h>
     1.6  
     1.7 -// forward declaration
     1.8 -#if !defined _GLP_PROB && !defined GLP_PROB
     1.9 -#define _GLP_PROB
    1.10 -#define GLP_PROB
    1.11 -typedef struct { double _opaque_prob; } glp_prob;
    1.12 -/* LP/MIP problem object */
    1.13 -#endif
    1.14 -
    1.15  namespace lemon {
    1.16  
    1.17 +  namespace _solver_bits {
    1.18 +    class VoidPtr {
    1.19 +    private:
    1.20 +      void *_ptr;      
    1.21 +    public:
    1.22 +      VoidPtr() : _ptr(0) {}
    1.23 +
    1.24 +      template <typename T>
    1.25 +      VoidPtr(T* ptr) : _ptr(reinterpret_cast<void*>(ptr)) {}
    1.26 +
    1.27 +      template <typename T>
    1.28 +      VoidPtr& operator=(T* ptr) { 
    1.29 +        _ptr = reinterpret_cast<void*>(ptr); 
    1.30 +        return *this;
    1.31 +      }
    1.32 +
    1.33 +      template <typename T>
    1.34 +      operator T*() const { return reinterpret_cast<T*>(_ptr); }
    1.35 +    };
    1.36 +  }
    1.37  
    1.38    /// \brief Base interface for the GLPK LP and MIP solver
    1.39    ///
    1.40 @@ -43,8 +55,7 @@
    1.41    class GlpkBase : virtual public LpBase {
    1.42    protected:
    1.43  
    1.44 -    typedef glp_prob LPX;
    1.45 -    glp_prob* lp;
    1.46 +    _solver_bits::VoidPtr lp;
    1.47  
    1.48      GlpkBase();
    1.49      GlpkBase(const GlpkBase&);
    1.50 @@ -123,9 +134,9 @@
    1.51    public:
    1.52  
    1.53      ///Pointer to the underlying GLPK data structure.
    1.54 -    LPX *lpx() {return lp;}
    1.55 +    _solver_bits::VoidPtr lpx() {return lp;}
    1.56      ///Const pointer to the underlying GLPK data structure.
    1.57 -    const LPX *lpx() const {return lp;}
    1.58 +    _solver_bits::VoidPtr lpx() const {return lp;}
    1.59  
    1.60      ///Returns the constraint identifier understood by GLPK.
    1.61      int lpxRow(Row r) const { return rows(id(r)); }