/usr/include/soci/query_transformation.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) 2013 Mateusz Loskot <mateusz@loskot.net>
// 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_QUERY_TRANSFORMATION_H_INCLUDED
#define SOCI_QUERY_TRANSFORMATION_H_INCLUDED
#include "soci-config.h"
#include <functional>
#include <string>
namespace soci
{
namespace details
{
// Query transformation is a mechanism that enables user to apply
// any string-to-string transformation to SQL statement just
// before it is executed.
// Transformation procedure is specified by user,
// be it a function or an arbitrary type as long as it
// defines operator() with the appropriate signature:
// unary function takes any type converible-to std::string
// and returns std::string.
class query_transformation_function
: public std::unary_function<std::string const&, std::string>
{
public:
virtual ~query_transformation_function() {}
virtual result_type operator()(argument_type a) const = 0;
};
template <typename T>
class query_transformation : public query_transformation_function
{
public:
query_transformation(T callback)
: callback_(callback)
{}
result_type operator()(argument_type query) const
{
return callback_(query);
}
private:
T callback_;
};
} // namespace details
} // namespace soci
#endif // SOCI_QUERY_TRANSFORMATION_H_INCLUDED
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