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// (C) Copyright Gennadiy Rozental 2001.
// 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)
// See http://www.boost.org/libs/test for the library home page.
//
///@file
///Defines range generator
// ***************************************************************************
#ifndef BOOST_TEST_DATA_MONOMORPHIC_GENERATORS_XRANGE_HPP_112011GER
#define BOOST_TEST_DATA_MONOMORPHIC_GENERATORS_XRANGE_HPP_112011GER
// Boost.Test
#include <boost/test/data/config.hpp>
#include <boost/test/data/monomorphic/generators/keywords.hpp>
#include <boost/test/data/monomorphic/generate.hpp>
// Boost
#include <boost/optional.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/type_traits/is_unsigned.hpp>
// STL
#include <limits>
#include <cmath>
#include <boost/test/detail/suppress_warnings.hpp>
//____________________________________________________________________________//
namespace boost {
namespace unit_test {
namespace data {
namespace monomorphic {
// ************************************************************************** //
// ************** monomorphic::xrange_t ************** //
// ************************************************************************** //
/*!@brief Generator for the range sequences
*
* This class implements the generator concept (see @ref boost::unit_test::data::monomorphic::generated_by) for implementing
* a range like sequence of numbers.
*/
template<typename SampleType, typename StepType=SampleType>
class xrange_t {
public:
typedef SampleType sample;
xrange_t( SampleType const& begin_, StepType const& step_, data::size_t size_ )
: m_begin( begin_ )
, m_curr( begin_ )
, m_step( step_ )
, m_index( 0 )
, m_size( size_ )
{}
// Generator interface
data::size_t capacity() const { return m_size; }
SampleType next()
{
if( m_index == m_size )
return m_curr;
SampleType res = m_curr;
m_curr += m_step;
++m_index;
return res;
}
void reset()
{
m_curr = m_begin;
m_index = 0;
}
private:
// Data members
SampleType m_begin;
SampleType m_curr;
StepType m_step;
data::size_t m_index;
data::size_t m_size;
};
//____________________________________________________________________________//
namespace ds_detail {
template<typename SampleType, typename StepType=SampleType>
struct make_xrange {
static StepType abs( StepType s, boost::true_type* ) { return s; }
static StepType abs( StepType s, boost::false_type* ) { return std::abs(s); }
typedef xrange_t<SampleType, StepType> range_gen;
template<typename Params>
static generated_by<range_gen>
_( Params const& params )
{
SampleType begin_val = params.has( data::begin ) ? params[data::begin] : SampleType();
optional<SampleType> end_val = params.has( data::end ) ? params[data::end] : optional<SampleType>();
StepType step_val = params.has( data::step ) ? params[data::step] : 1;
BOOST_TEST_DS_ASSERT( step_val != 0, "Range step can't be zero" );
data::size_t size;
if( !end_val.is_initialized() )
size = BOOST_TEST_DS_INFINITE_SIZE;
else {
BOOST_TEST_DS_ASSERT( (step_val < 0) ^ (begin_val < *end_val), "Invalid step direction" );
SampleType abs_distance = step_val < 0 ? begin_val - *end_val : *end_val-begin_val;
StepType abs_step = make_xrange::abs(step_val, (typename boost::is_unsigned<StepType>::type*)0 );
std::size_t s = static_cast<std::size_t>(abs_distance/abs_step);
if( static_cast<SampleType>(s*abs_step) < abs_distance )
s++;
size = s;
}
return generated_by<range_gen>( range_gen( begin_val, step_val, size ) );
}
};
} // namespace ds_detail
} // namespace monomorphic
//____________________________________________________________________________//
//! Creates a range (sequence) dataset.
//!
//! The following overloads are available:
//! @code
//! auto d = xrange();
//! auto d = xrange(end_val);
//! auto d = xrange(end_val, param);
//! auto d = xrange(begin_val, end_val);
//! auto d = xrange(begin_val, end_val, step_val);
//! auto d = xrange(param);
//! @endcode
//!
//! - @c begin_val indicates the start of the sequence (default to 0).
//! - @c end_val is the end of the sequence. If ommited, the dataset has infinite size.\n
//! - @c step_val is the step between two consecutive elements of the sequence, and defaults to 1.\n
//! - @c param is the named parameters that describe the sequence. The following parameters are accepted:
//! - @c begin: same meaning @c begin_val
//! - @c end: same meaning as @c end_val
//! - @c step: same meaning as @c step_val
//!
//!
//! The returned value is an object that implements the dataset API.
//!
//! @note the step size cannot be null, and it should be positive if @c begin_val < @c end_val, negative otherwise.
template<typename SampleType, typename Params>
inline monomorphic::generated_by<monomorphic::xrange_t<SampleType>>
xrange( Params const& params )
{
return monomorphic::ds_detail::make_xrange<SampleType>::_( params );
}
//____________________________________________________________________________//
/// @overload boost::unit_test::data::xrange()
template<typename SampleType>
inline monomorphic::generated_by<monomorphic::xrange_t<SampleType>>
xrange( SampleType const& end_val )
{
return monomorphic::ds_detail::make_xrange<SampleType>::_( data::end=end_val );
}
//____________________________________________________________________________//
/// @overload boost::unit_test::data::xrange()
template<typename SampleType, typename Params>
inline typename enable_if_c<nfp::is_named_param_pack<Params>::value,
monomorphic::generated_by<monomorphic::xrange_t<SampleType>>>::type
xrange( SampleType const& end_val, Params const& params )
{
return monomorphic::ds_detail::make_xrange<SampleType>::_(( params, data::end=end_val ));
}
//____________________________________________________________________________//
/// @overload boost::unit_test::data::xrange()
template<typename SampleType>
inline monomorphic::generated_by<monomorphic::xrange_t<SampleType>>
xrange( SampleType const& begin_val, SampleType const& end_val )
{
return monomorphic::ds_detail::make_xrange<SampleType>::_((
data::begin=begin_val,
data::end=end_val ));
}
//____________________________________________________________________________//
/// @overload boost::unit_test::data::xrange()
template<typename SampleType,typename StepType>
inline monomorphic::generated_by<monomorphic::xrange_t<SampleType>>
xrange( SampleType const& begin_val, SampleType const& end_val, StepType const& step_val )
{
return monomorphic::ds_detail::make_xrange<SampleType,StepType>::_((
data::begin=begin_val,
data::end=end_val,
data::step=step_val ));
}
//____________________________________________________________________________//
} // namespace data
} // namespace unit_test
} // namespace boost
#include <boost/test/detail/enable_warnings.hpp>
#endif // BOOST_TEST_DATA_MONOMORPHIC_GENERATORS_XRANGE_HPP_112011GER
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