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       1              : // Copyright (C) 2026 Free Software Foundation, Inc.
       2              : 
       3              : // This file is part of GCC.
       4              : 
       5              : // GCC is free software; you can redistribute it and/or modify it under
       6              : // the terms of the GNU General Public License as published by the Free
       7              : // Software Foundation; either version 3, or (at your option) any later
       8              : // version.
       9              : 
      10              : // GCC is distributed in the hope that it will be useful, but WITHOUT ANY
      11              : // WARRANTY; without even the implied warranty of MERCHANTABILITY or
      12              : // FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      13              : // for more details.
      14              : 
      15              : // You should have received a copy of the GNU General Public License
      16              : // along with GCC; see the file COPYING3.  If not see
      17              : // <http://www.gnu.org/licenses/>.
      18              : 
      19              : #ifndef RUST_CLONEABLE
      20              : #define RUST_CLONEABLE
      21              : 
      22              : #include "rust-system.h"
      23              : 
      24              : namespace Rust {
      25              : 
      26              : // used to automatically copy cloneable types
      27              : 
      28              : template <typename T> struct CloneableDelegate
      29              : {
      30              : };
      31              : 
      32          344 : template <typename T> class Cloneable
      33              : {
      34              : public:
      35              :   template <typename... Args>
      36        91509 :   Cloneable (Args &&...args) : inner (std::forward<Args> (args)...)
      37              :   {}
      38              : 
      39        62745 :   Cloneable (const Cloneable &other)
      40        62745 :     : Cloneable (CloneableDelegate<T>::clone (other.inner))
      41        62745 :   {}
      42              : 
      43            0 :   template <typename Arg> Cloneable &operator= (Arg &&arg)
      44              :   {
      45            0 :     inner = std::forward<Arg> (arg);
      46              :     return *this;
      47              :   }
      48              : 
      49              :   Cloneable &operator= (const Cloneable &other)
      50              :   {
      51              :     inner = CloneableDelegate<T>::clone (other.inner);
      52              :     return *this;
      53              :   }
      54              : 
      55              :   Cloneable (Cloneable &&) = default;
      56              :   Cloneable &operator= (Cloneable &&) = default;
      57              : 
      58        54814 :   T &get () { return inner; }
      59          514 :   const T &get () const { return inner; }
      60              : 
      61          594 :   bool operator== (decltype (nullptr)) const { return inner == nullptr; }
      62              : 
      63       598897 :   bool operator!= (decltype (nullptr)) const { return inner != nullptr; }
      64              : 
      65              : private:
      66              :   T inner;
      67              : };
      68              : 
      69              : // general specializations
      70              : 
      71              : template <typename T> struct CloneableDelegate<std::vector<T>>
      72              : {
      73         4841 :   static std::vector<T> clone (const std::vector<T> &other)
      74              :   {
      75         4841 :     std::vector<T> ret;
      76         4841 :     ret.reserve (other.size ());
      77        11997 :     for (auto &ent : other)
      78         7156 :       ret.push_back (CloneableDelegate<T>::clone (ent));
      79         4841 :     return ret;
      80              :   }
      81              : };
      82              : 
      83              : } // namespace Rust
      84              : 
      85              : #endif // RUST_CLONEABLE