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// Copyright (C) 2012 Davis E. King (davis@dlib.net)
// License: Boost Software License See LICENSE.txt for the full license.
#ifndef DLIB_CIRCULAR_BuFFER_Hh_
#define DLIB_CIRCULAR_BuFFER_Hh_
#include "circular_buffer_abstract.h"
#include <vector>
#include "../algs.h"
#include "../serialize.h"
#include "../matrix/matrix_mat.h"
namespace dlib
{
// ----------------------------------------------------------------------------------------
template <
typename T
>
class circular_buffer
{
public:
typedef default_memory_manager mem_manager_type;
typedef T value_type;
typedef T type;
circular_buffer()
{
}
explicit circular_buffer(unsigned long s)
{
resize(s);
}
void clear (
)
{
offset = 0;
data.clear();
}
T& operator[] ( unsigned long i)
{
DLIB_ASSERT(i < size(),
"\t T& circular_buffer::operator[](i)"
<< "\n\t You have supplied an invalid index"
<< "\n\t this: " << this
<< "\n\t i: " << i
<< "\n\t size(): " << size()
);
return data[(i+offset)%data.size()];
}
const T& operator[] ( unsigned long i) const
{
DLIB_ASSERT(i < size(),
"\t const T& circular_buffer::operator[](i)"
<< "\n\t You have supplied an invalid index"
<< "\n\t this: " << this
<< "\n\t i: " << i
<< "\n\t size(): " << size()
);
return data[(i+offset)%data.size()];
}
void resize(unsigned long size)
{
offset = 0;
data.resize(size);
}
void assign(
unsigned long size,
const T& value
)
{
offset = 0;
data.assign(size,value);
}
unsigned long size() const { return data.size(); }
void push_front(const T& value)
{
if (data.size() != 0)
{
offset = (offset - 1 + data.size())%data.size();
data[offset] = value;
}
}
void push_back(const T& value)
{
if (data.size() != 0)
{
data[offset] = value;
offset = (offset + 1 + data.size())%data.size();
}
}
T& front(
)
{
DLIB_CASSERT(size() > 0,
"\t T& circular_buffer::front()"
<< "\n\t You can't call front() on an empty circular_buffer"
<< "\n\t this: " << this
);
return (*this)[0];
}
const T& front(
) const
{
DLIB_CASSERT(size() > 0,
"\t const T& circular_buffer::front()"
<< "\n\t You can't call front() on an empty circular_buffer"
<< "\n\t this: " << this
);
return (*this)[0];
}
T& back(
)
{
DLIB_CASSERT(size() > 0,
"\t T& circular_buffer::back()"
<< "\n\t You can't call back() on an empty circular_buffer"
<< "\n\t this: " << this
);
return (*this)[size()-1];
}
const T& back(
) const
{
DLIB_CASSERT(size() > 0,
"\t const T& circular_buffer::back()"
<< "\n\t You can't call back() on an empty circular_buffer"
<< "\n\t this: " << this
);
return (*this)[size()-1];
}
void swap( circular_buffer& item)
{
std::swap(item.offset, offset);
data.swap(item.data);
}
private:
std::vector<T> data;
unsigned long offset = 0;
};
// ----------------------------------------------------------------------------------------
template <
typename T
>
void swap (
circular_buffer<T>& a,
circular_buffer<T>& b
) { a.swap(b); }
// ----------------------------------------------------------------------------------------
template <
typename T
>
void serialize (
const circular_buffer<T>& item,
std::ostream& out
)
{
try
{
serialize(item.size(),out);
for (unsigned long i = 0; i < item.size(); ++i)
serialize(item[i],out);
}
catch (serialization_error& e)
{
throw serialization_error(e.info + "\n while serializing object of type circular_buffer");
}
}
// ----------------------------------------------------------------------------------------
template <
typename T
>
void deserialize (
circular_buffer<T>& item,
std::istream& in
)
{
try
{
unsigned long size;
deserialize(size,in);
item.resize(size);
for (unsigned long i = 0; i < size; ++i)
deserialize(item[i],in);
}
catch (serialization_error& e)
{
item.clear();
throw serialization_error(e.info + "\n while deserializing object of type circular_buffer");
}
}
// ----------------------------------------------------------------------------------------
template <
typename T
>
const matrix_op<op_array_to_mat<circular_buffer<T> > > mat (
const circular_buffer<T>& m
)
{
typedef op_array_to_mat<circular_buffer<T> > op;
return matrix_op<op>(op(m));
}
// ----------------------------------------------------------------------------------------
}
#endif // DLIB_CIRCULAR_BuFFER_Hh_
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