text: // Copyright (c) 2017, The Monero Project
  // 
  // All rights reserved.
  // 
  // Redistribution and use in source and binary forms, with or without modification, are
  // permitted provided that the following conditions are met:
  // 
  // 1. Redistributions of source code must retain the above copyright notice, this list of
  //    conditions and the following disclaimer.
  // 
  // 2. Redistributions in binary form must reproduce the above copyright notice, this list
  //    of conditions and the following disclaimer in the documentation and/or other
  //    materials provided with the distribution.
  // 
  // 3. Neither the name of the copyright holder nor the names of its contributors may be
  //    used to endorse or promote products derived from this software without specific
  //    prior written permission.
  // 
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
  // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
  // THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  // STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
  // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  
  #pragma once
  
  #include <stddef.h>
  #include <vector>
  #include <string>
  
  namespace epee
  {
    class wipeable_string
    {
    public:
      wipeable_string() {}
      wipeable_string(const wipeable_string &other);
      wipeable_string(wipeable_string &&other);
      wipeable_string(const std::string &other);
      wipeable_string(std::string &&other);
      wipeable_string(const char *s);
      ~wipeable_string();
      void wipe();
      void push_back(char c);
      void pop_back();
      const char *data() const noexcept { return buffer.data(); }
      size_t size() const noexcept { return buffer.size(); }
      bool empty() const noexcept { return buffer.empty(); }
      void resize(size_t sz);
      void reserve(size_t sz);
      void clear();
      bool operator==(const wipeable_string &other) const noexcept { return buffer == other.buffer; }
      bool operator!=(const wipeable_string &other) const noexcept { return buffer != other.buffer; }
      wipeable_string &operator=(wipeable_string &&other);
      wipeable_string &operator=(const wipeable_string &other);
  
      static void set_wipe(void *(*f)(void*, size_t)) { wipefunc = f; }
  
    private:
      void grow(size_t sz, size_t reserved = 0);
  
    private:
      std::vector<char> buffer;
      static void *(*wipefunc)(void*, size_t);
    };
  }
  