gdbsupport/gdb_unique_ptr.h

   1 /* std::unique_ptr specializations for GDB.
   2
   3    Copyright (C) 2016-2022 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef COMMON_GDB_UNIQUE_PTR_H
  21 #define COMMON_GDB_UNIQUE_PTR_H
  22
  23 #include <memory>
  24 #include <string>
  25 #include "gdbsupport/gdb-xfree.h"
  26
  27 namespace gdb
  28 {
  29 /* Define gdb::unique_xmalloc_ptr, a std::unique_ptr that manages
  30    xmalloc'ed memory.  */
  31
  32 /* The deleter for std::unique_xmalloc_ptr.  Uses xfree.  */
  33 template <typename T>
  34 struct xfree_deleter
  35 {
  36   void operator() (T *ptr) const { xfree (ptr); }
  37 };
  38
  39 /* Same, for arrays.  */
  40 template <typename T>
  41 struct xfree_deleter<T[]>
  42 {
  43   void operator() (T *ptr) const { xfree (ptr); }
  44 };
  45
  46 /* Import the standard unique_ptr to our namespace with a custom
  47    deleter.  */
  48
  49 template<typename T> using unique_xmalloc_ptr
  50   = std::unique_ptr<T, xfree_deleter<T>>;
  51
  52 /* A no-op deleter.  */
  53 template<typename T>
  54 struct noop_deleter
  55 {
  56   void operator() (T *ptr) const { }
  57 };
  58
  59 } /* namespace gdb */
  60
  61 /* Dup STR and return a unique_xmalloc_ptr for the result.  */
  62
  63 static inline gdb::unique_xmalloc_ptr<char>
  64 make_unique_xstrdup (const char *str)
  65 {
  66   return gdb::unique_xmalloc_ptr<char> (xstrdup (str));
  67 }
  68
  69 /* Dup the first N characters of STR and return a unique_xmalloc_ptr
  70    for the result.  The result is always \0-terminated.  */
  71
  72 static inline gdb::unique_xmalloc_ptr<char>
  73 make_unique_xstrndup (const char *str, size_t n)
  74 {
  75   return gdb::unique_xmalloc_ptr<char> (xstrndup (str, n));
  76 }
  77
  78 /* An overload of operator+= fo adding gdb::unique_xmalloc_ptr<char> to a
  79    std::string.  */
  80
  81 static inline std::string &
  82 operator+= (std::string &lhs, const gdb::unique_xmalloc_ptr<char> &rhs)
  83 {
  84   return lhs += rhs.get ();
  85 }
  86
  87 /* An overload of operator+ for adding gdb::unique_xmalloc_ptr<char> to a
  88    std::string.  */
  89
  90 static inline std::string
  91 operator+ (const std::string &lhs, const gdb::unique_xmalloc_ptr<char> &rhs)
  92 {
  93   return lhs + rhs.get ();
  94 }
  95
  96 #endif /* COMMON_GDB_UNIQUE_PTR_H */