/usr/include/soci/exchange-traits.h is in libsoci-dev 3.2.3-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Copyright (C) 2004-2008 Maciej Sobczak, Stephen Hutton
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef SOCI_EXCHANGE_TRAITS_H_INCLUDED
#define SOCI_EXCHANGE_TRAITS_H_INCLUDED
#include "type-conversion-traits.h"
#include "soci-backend.h"
// std
#include <ctime>
#include <string>
#include <vector>
namespace soci
{
namespace details
{
struct basic_type_tag {};
struct user_type_tag {};
template <typename T>
struct exchange_traits
{
// this is used for tag-dispatch between implementations for basic types
// and user-defined types
typedef user_type_tag type_family;
enum // anonymous
{
x_type =
exchange_traits
<
typename type_conversion<T>::base_type
>::x_type
};
};
template <>
struct exchange_traits<short>
{
typedef basic_type_tag type_family;
enum { x_type = x_short };
};
template <>
struct exchange_traits<unsigned short> : exchange_traits<short>
{
};
template <>
struct exchange_traits<int>
{
typedef basic_type_tag type_family;
enum { x_type = x_integer };
};
template <>
struct exchange_traits<unsigned int> : exchange_traits<int>
{
};
template <>
struct exchange_traits<char>
{
typedef basic_type_tag type_family;
enum { x_type = x_char };
};
template <>
struct exchange_traits<long long>
{
typedef basic_type_tag type_family;
enum { x_type = x_long_long };
};
template <>
struct exchange_traits<unsigned long long>
{
typedef basic_type_tag type_family;
enum { x_type = x_unsigned_long_long };
};
// long must be mapped either to x_integer or x_long_long:
template<int long_size> struct long_traits_helper;
template<> struct long_traits_helper<4> { enum { x_type = x_integer }; };
template<> struct long_traits_helper<8> { enum { x_type = x_long_long }; };
template <>
struct exchange_traits<long int>
{
typedef basic_type_tag type_family;
enum { x_type = long_traits_helper<sizeof(long int)>::x_type };
};
template <>
struct exchange_traits<unsigned long> : exchange_traits<long>
{
};
template <>
struct exchange_traits<double>
{
typedef basic_type_tag type_family;
enum { x_type = x_double };
};
template <>
struct exchange_traits<std::string>
{
typedef basic_type_tag type_family;
enum { x_type = x_stdstring };
};
template <>
struct exchange_traits<std::tm>
{
typedef basic_type_tag type_family;
enum { x_type = x_stdtm };
};
template <typename T>
struct exchange_traits<std::vector<T> >
{
typedef typename exchange_traits<T>::type_family type_family;
enum { x_type = exchange_traits<T>::x_type };
};
} // namespace details
} // namespace soci
#endif // SOCI_EXCHANGE_TRAITS_H_INCLUDED
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