serialize_handlers.hh

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 * terms below provided that you ensure that this notice is replicated
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 * modified or unmodified, in source code or in binary form.
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 * Copyright (c) 2002-2005 The Regents of The University of Michigan
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/* @file
 * Serialization Interface Declarations
 */
 
#ifndef __SERIALIZE_HANDLERS_HH__
#define __SERIALIZE_HANDLERS_HH__
 
 
#include <iostream>
#include <type_traits>
#include <utility>
 
#include "base/str.hh"
 
// To add support for a new type of field that can be serialized, define
// template specializations of the two classes below, ParseParam and ShowParam,
// as described above each. The way ParseParam is specialized for std::string
// or ShowParam is specialied for bool can be used as examples.
 
/*
 * A structure which should be specialized to contain a static method with the
 * signature:
 *
 * bool parse(const std::string &s, T &value)
 *
 * which fills in value using the contents of s, and returns if that was
 * successful.
 */
template <class T, class Enable=void>
struct ParseParam;
 
// Specialization for anything to_number can accept.
template <class T>
struct ParseParam<T, decltype(to_number("", std::declval<T&>()), void())>
{
    static bool
    parse(const std::string &s, T &value)
    {
        return to_number(s, value);
    }
};
 
template <>
struct ParseParam<bool>
{
    static bool
    parse(const std::string &s, bool &value)
    {
        return to_bool(s, value);
    }
};
 
template <>
struct ParseParam<std::string>
{
    static bool
    parse(const std::string &s, std::string &value)
    {
        // String requires no processing to speak of
        value = s;
        return true;
    }
};
 
/*
 * A structure which should be specialized to contain a static method with the
 * signature:
 *
 * void show(std::ostream &os, const T &value)
 *
 * which outputs value to the stream os.
 *
 * This default implementation falls back to the << operator which should work
 * for many types.
 */
template <class T, class Enabled=void>
struct ShowParam
{
    static void show(std::ostream &os, const T &value) { os << value; }
};
 
// Handle characters specially so that we print their value, not the character
// they encode.
template <class T>
struct ShowParam<T, std::enable_if_t<std::is_same<char, T>::value ||
                                     std::is_same<unsigned char, T>::value ||
                                     std::is_same<signed char, T>::value>>
{
    static void
    show(std::ostream &os, const T &value)
    {
        if (std::is_signed<T>::value)
            os << (int)value;
        else
            os << (unsigned int)value;
    }
};
 
template <>
struct ShowParam<bool>
{
    static void
    show(std::ostream &os, const bool &value)
    {
        // Display bools as strings
        os << (value ? "true" : "false");
    }
};
 
#endif // __SERIALIZE_HANDLERS_HH__