~drizzle-trunk/drizzle/development : contents of drizzled/util/data

~drizzle-trunk/drizzle/development : (revision 2440.2.28)

/* Drizzle
 * Copyright (C) 2011 Olaf van der Spek
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once

#include <cstddef>
#include <cstring>
#include <ostream>
#include <string>

template <class T>
class data_ref_basic
{
public:
  data_ref_basic()
  {
    clear();
  }

  template <class U>
  data_ref_basic(const U& c)
  {
    if (c.begin() == c.end())
      clear();
    else
      assign(&*c.begin(), &*c.end());
  }

  data_ref_basic(const void* b, const void* e)
  {
    assign(b, e);
  }

  data_ref_basic(const void* b, size_t sz)
  {
    assign(b, sz);
  }

  explicit data_ref_basic(const char* b)
  {
    assign(b, strlen(b));
  }

  void clear()
  {
    begin_ = end_ = reinterpret_cast<T>("");
  }

  void assign(const void* b, const void* e)
  {
    begin_ = reinterpret_cast<T>(b);
    end_ = reinterpret_cast<T>(e);
  }

  void assign(const void* b, size_t sz)
  {
    begin_ = reinterpret_cast<T>(b);
    end_ = begin_ + sz;
  }

  T begin() const
  {
    return begin_;
  }

  T end() const
  {
    return end_;
  }

  T data() const
  {
    return begin();
  }

  size_t size() const
  {
    return end() - begin();
  }

  bool empty() const
  {
    return begin() == end();
  }
private:
  T begin_;
  T end_;
};

typedef data_ref_basic<const unsigned char*> data_ref;
typedef data_ref_basic<const char*> str_ref;

inline std::ostream& operator<<(std::ostream& os, str_ref v)
{
  return os.write(v.data(), v.size());
}

inline std::string to_string(str_ref v)
{
  return std::string(v.data(), v.size());
}

2318.8.1 by Olaf van der Spek Add data_ref.h	1	/* Drizzle
	2	* Copyright (C) 2011 Olaf van der Spek
	3	*
	4	* This program is free software: you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License as published by
	6	* the Free Software Foundation, either version 2 of the License, or
	7	* (at your option) any later version.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program. If not, see <http://www.gnu.org/licenses/>.
	16	*/
	17
	18	#pragma once
	19
	20	#include <cstddef>
	21	#include <cstring>
2385.1.6 by Olaf van der Spek Use str_ref	22	#include <ostream>
2430.1.7 by Olaf van der Spek Use size()	23	#include <string>
2318.8.1 by Olaf van der Spek Add data_ref.h	24
	25	template <class T>
	26	class data_ref_basic
	27	{
	28	public:
	29	data_ref_basic()
	30	{
2433.1.1 by Olaf van der Spek Refactor	31	clear();
2318.8.1 by Olaf van der Spek Add data_ref.h	32	}
	33
	34	template <class U>
2385.1.7 by Olaf van der Spek Rename set_db to set_schema	35	data_ref_basic(const U& c)
2318.8.1 by Olaf van der Spek Add data_ref.h	36	{
2385.1.3 by Olaf van der Spek Refactor getTableName	37	if (c.begin() == c.end())
2318.8.1 by Olaf van der Spek Add data_ref.h	38	clear();
	39	else
	40	assign(&c.begin(), &c.end());
	41	}
	42
	43	data_ref_basic(const void* b, const void* e)
	44	{
	45	assign(b, e);
	46	}
	47
	48	data_ref_basic(const void* b, size_t sz)
	49	{
	50	assign(b, sz);
	51	}
	52
	53	explicit data_ref_basic(const char* b)
	54	{
	55	assign(b, strlen(b));
	56	}
	57
2433.1.5 by Olaf van der Spek Use assign(), data() and size()	58	void clear()
2318.8.1 by Olaf van der Spek Add data_ref.h	59	{
2440.2.28 by Olaf van der Spek Refactor	60	begin_ = end_ = reinterpret_cast<T>("");
2318.8.1 by Olaf van der Spek Add data_ref.h	61	}
	62
	63	void assign(const void* b, const void* e)
	64	{
2318.8.9 by Olaf van der Spek Use boost::to_upper	65	begin_ = reinterpret_cast<T>(b);
2318.8.9 by Olaf van der Spek Use boost::to_upper	66	end_ = reinterpret_cast<T>(e);
2318.8.1 by Olaf van der Spek Add data_ref.h	67	}
	68
	69	void assign(const void* b, size_t sz)
	70	{
2318.8.9 by Olaf van der Spek Use boost::to_upper	71	begin_ = reinterpret_cast<T>(b);
2318.8.9 by Olaf van der Spek Use boost::to_upper	72	end_ = begin_ + sz;
2318.8.1 by Olaf van der Spek Add data_ref.h	73	}
	74
	75	T begin() const
	76	{
	77	return begin_;
	78	}
	79
	80	T end() const
	81	{
	82	return end_;
	83	}
	84
	85	T data() const
	86	{
	87	return begin();
	88	}
	89
	90	size_t size() const
	91	{
	92	return end() - begin();
	93	}
	94
	95	bool empty() const
	96	{
	97	return begin() == end();
	98	}
	99	private:
	100	T begin_;
	101	T end_;
	102	};
	103
	104	typedef data_ref_basic<const unsigned char*> data_ref;
	105	typedef data_ref_basic<const char*> str_ref;
2430.1.7 by Olaf van der Spek Use size()	106
	107	inline std::ostream& operator<<(std::ostream& os, str_ref v)
	108	{
2440.2.10 by Olaf van der Spek Use data_ref	109	return os.write(v.data(), v.size());
2430.1.7 by Olaf van der Spek Use size()	110	}
	111
	112	inline std::string to_string(str_ref v)
	113	{
	114	return std::string(v.data(), v.size());
	115	}