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StdVector.h
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Sat, Feb 22, 13:02

StdVector.h
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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2009 Gael Guennebaud <gael.guennebaud@inria.fr>
// Copyright (C) 2009 Hauke Heibel <hauke.heibel@googlemail.com>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
#ifndef EIGEN_STDVECTOR_H
#define EIGEN_STDVECTOR_H
#include "details.h"
/**
* This section contains a convenience MACRO which allows an easy specialization of
* std::vector such that for data types with alignment issues the correct allocator
* is used automatically.
*/
#define EIGEN_DEFINE_STL_VECTOR_SPECIALIZATION(...) \
namespace std \
{ \
template<> \
class vector<__VA_ARGS__, std::allocator<__VA_ARGS__> > \
: public vector<__VA_ARGS__, EIGEN_ALIGNED_ALLOCATOR<__VA_ARGS__> > \
{ \
typedef vector<__VA_ARGS__, EIGEN_ALIGNED_ALLOCATOR<__VA_ARGS__> > vector_base; \
public: \
typedef __VA_ARGS__ value_type; \
typedef vector_base::allocator_type allocator_type; \
typedef vector_base::size_type size_type; \
typedef vector_base::iterator iterator; \
explicit vector(const allocator_type& a = allocator_type()) : vector_base(a) {} \
template<typename InputIterator> \
vector(InputIterator first, InputIterator last, const allocator_type& a = allocator_type()) : vector_base(first, last, a) {} \
vector(const vector& c) : vector_base(c) {} \
explicit vector(size_type num, const value_type& val = value_type()) : vector_base(num, val) {} \
vector(iterator start_, iterator end_) : vector_base(start_, end_) {} \
vector& operator=(const vector& x) { \
vector_base::operator=(x); \
return *this; \
} \
}; \
}
// Don't specialize if containers are implemented according to C++11
#if !EIGEN_HAS_CXX11_CONTAINERS
namespace std {
#define EIGEN_STD_VECTOR_SPECIALIZATION_BODY \
public: \
typedef T value_type; \
typedef typename vector_base::allocator_type allocator_type; \
typedef typename vector_base::size_type size_type; \
typedef typename vector_base::iterator iterator; \
typedef typename vector_base::const_iterator const_iterator; \
explicit vector(const allocator_type& a = allocator_type()) : vector_base(a) {} \
template<typename InputIterator> \
vector(InputIterator first, InputIterator last, const allocator_type& a = allocator_type()) \
: vector_base(first, last, a) {} \
vector(const vector& c) : vector_base(c) {} \
explicit vector(size_type num, const value_type& val = value_type()) : vector_base(num, val) {} \
vector(iterator start_, iterator end_) : vector_base(start_, end_) {} \
vector& operator=(const vector& x) { \
vector_base::operator=(x); \
return *this; \
}
template<typename T>
class vector<T,EIGEN_ALIGNED_ALLOCATOR<T> >
: public vector<EIGEN_WORKAROUND_MSVC_STL_SUPPORT(T),
Eigen::aligned_allocator_indirection<EIGEN_WORKAROUND_MSVC_STL_SUPPORT(T)> >
{
typedef vector<EIGEN_WORKAROUND_MSVC_STL_SUPPORT(T),
Eigen::aligned_allocator_indirection<EIGEN_WORKAROUND_MSVC_STL_SUPPORT(T)> > vector_base;
EIGEN_STD_VECTOR_SPECIALIZATION_BODY
void resize(size_type new_size)
{ resize(new_size, T()); }
#if defined(_VECTOR_)
// workaround MSVC std::vector implementation
void resize(size_type new_size, const value_type& x)
{
if (vector_base::size() < new_size)
vector_base::_Insert_n(vector_base::end(), new_size - vector_base::size(), x);
else if (new_size < vector_base::size())
vector_base::erase(vector_base::begin() + new_size, vector_base::end());
}
void push_back(const value_type& x)
{ vector_base::push_back(x); }
using vector_base::insert;
iterator insert(const_iterator position, const value_type& x)
{ return vector_base::insert(position,x); }
void insert(const_iterator position, size_type new_size, const value_type& x)
{ vector_base::insert(position, new_size, x); }
#elif defined(_GLIBCXX_VECTOR) && (!(EIGEN_GNUC_AT_LEAST(4,1)))
/* Note that before gcc-4.1 we already have: std::vector::resize(size_type,const T&).
* However, this specialization is still needed to make the above EIGEN_DEFINE_STL_VECTOR_SPECIALIZATION trick to work. */
void resize(size_type new_size, const value_type& x)
{
vector_base::resize(new_size,x);
}
#elif defined(_GLIBCXX_VECTOR) && EIGEN_GNUC_AT_LEAST(4,2)
// workaround GCC std::vector implementation
void resize(size_type new_size, const value_type& x)
{
if (new_size < vector_base::size())
vector_base::_M_erase_at_end(this->_M_impl._M_start + new_size);
else
vector_base::insert(vector_base::end(), new_size - vector_base::size(), x);
}
#else
// either GCC 4.1 or non-GCC
// default implementation which should always work.
void resize(size_type new_size, const value_type& x)
{
if (new_size < vector_base::size())
vector_base::erase(vector_base::begin() + new_size, vector_base::end());
else if (new_size > vector_base::size())
vector_base::insert(vector_base::end(), new_size - vector_base::size(), x);
}
#endif
};
}
#endif // !EIGEN_HAS_CXX11_CONTAINERS
#endif // EIGEN_STDVECTOR_H

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