src/gromacs/utility/unique_cptr.h

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  36 /*! \file
  37  * \brief
  38  * Declares gmx::unique_cptr and gmx::sfree_guard.
  39  *
  40  * \author Teemu Murtola <teemu.murtola@gmail.com>
  41  * \inlibraryapi
  42  * \ingroup module_utility
  43  */
  44 #ifndef GMX_UTILITY_UNIQUE_PTR_SFREE_H
  45 #define GMX_UTILITY_UNIQUE_PTR_SFREE_H
  46
  47 #include <cstdlib>
  48
  49 #include <memory>
  50
  51 #include "gromacs/utility/smalloc.h"
  52
  53 namespace gmx
  54 {
  55
  56 /*! \brief Wrapper of standard library free(), to be used as
  57  * unique_cptr deleter for memory allocated by malloc, e.g. by an
  58  * external library such as TNG. */
  59 template<class T>
  60 inline void free_wrapper(T* p)
  61 {
  62     free(p);
  63 }
  64
  65 //! sfree wrapper to be used as unique_cptr deleter
  66 template<class T>
  67 inline void sfree_wrapper(T* p)
  68 {
  69     sfree(p);
  70 }
  71
  72 //! \internal \brief wrap function into functor to be used as deleter
  73 template<class T, void D(T*)>
  74 struct functor_wrapper
  75 {
  76     //! call wrapped function
  77     void operator()(T* t) { D(t); }
  78 };
  79
  80 //! unique_ptr which takes function pointer (has to return void) as template argument
  81 template<typename T, void D(T*) = sfree_wrapper>
  82 using unique_cptr = std::unique_ptr<T, functor_wrapper<T, D>>;
  83
  84 //! Simple guard which calls sfree. See unique_cptr for details.
  85 typedef unique_cptr<void> sfree_guard;
  86
  87
  88 //! Create unique_ptr with any deleter function or lambda
  89 template<typename T, typename D>
  90 std::unique_ptr<T, D> create_unique_with_deleter(T* t, D d)
  91 {
  92     return std::unique_ptr<T, D>(t, d);
  93 }
  94
  95 } // namespace gmx
  96
  97 #endif