src/gromacs/utility/unique_cptr.h

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  35 /*! \file
  36  * \brief
  37  * Declares gmx::unique_cptr and gmx::sfree_guard.
  38  *
  39  * \author Teemu Murtola <teemu.murtola@gmail.com>
  40  * \inlibraryapi
  41  * \ingroup module_utility
  42  */
  43 #ifndef GMX_UTILITY_UNIQUE_PTR_SFREE_H
  44 #define GMX_UTILITY_UNIQUE_PTR_SFREE_H
  45
  46 #include <cstdlib>
  47
  48 #include <memory>
  49
  50 #include "gromacs/utility/smalloc.h"
  51
  52 namespace gmx
  53 {
  54
  55 /*! \brief Wrapper of standard library free(), to be used as
  56  * unique_cptr deleter for memory allocated by malloc, e.g. by an
  57  * external library such as TNG. */
  58 template <class T>
  59 inline void free_wrapper(T *p)
  60 {
  61     free(p);
  62 }
  63
  64 //! sfree wrapper to be used as unique_cptr deleter
  65 template <class T>
  66 inline void sfree_wrapper(T *p)
  67 {
  68     sfree(p);
  69 }
  70
  71 //! \internal \brief wrap function into functor to be used as deleter
  72 template<class T, void D(T *)>
  73 struct functor_wrapper {
  74     //! call wrapped function
  75     void operator()(T* t) { D(t); }
  76 };
  77
  78 //! unique_ptr which takes function pointer (has to return void) as template argument
  79 template<typename T, void D(T *) = sfree_wrapper>
  80 using unique_cptr                = std::unique_ptr<T, functor_wrapper<T, D> >;
  81
  82 //! Simple guard which calls sfree. See unique_cptr for details.
  83 typedef unique_cptr<void> sfree_guard;
  84
  85
  86 //! Create unique_ptr with any deleter function or lambda
  87 template<typename T, typename D>
  88 std::unique_ptr<T, D> create_unique_with_deleter(T *t, D d) { return std::unique_ptr<T, D>(t, d); }
  89
  90 }      // namespace gmx
  91
  92 #endif