mirror of
https://github.com/triqs/dft_tools
synced 2024-12-27 06:43:40 +01:00
91 lines
4.1 KiB
C++
91 lines
4.1 KiB
C++
// (C) Copyright 2008-10 Lukas Gamper <gamperl -at- gmail.com>
|
|
// Brigitte Surer <surerb -at- phys.ethz.ch>
|
|
// Bela Bauer <bauerb -at- phys.ethz.ch>
|
|
//
|
|
// downgraded by O. Parcollet for compilation with icc11 & boost 1.45
|
|
//
|
|
// Use, modification, and distribution are subject to the Boost Software
|
|
// License, Version 1.0. (See at <http://www.boost.org/LICENSE_1_0.txt>.)
|
|
|
|
#include <vector>
|
|
#include <algorithm>
|
|
#include <boost/function.hpp>
|
|
#include <boost/ref.hpp>
|
|
#include <boost/shared_ptr.hpp>
|
|
#include <boost/make_shared.hpp>
|
|
#include <boost/lambda/lambda.hpp>
|
|
#include <boost/lambda/bind.hpp>
|
|
#include <boost/lambda/construct.hpp>
|
|
#include <boost/lambda/exceptions.hpp>
|
|
|
|
namespace boost{
|
|
template<typename R> class generator {
|
|
public:
|
|
static std::size_t const buffer_size = 1000;
|
|
template<typename Generator> generator(Generator const & gen, std::size_t size = buffer_size)
|
|
:
|
|
buf(make_shared<buffer>(gen, size))
|
|
, cur(buf->cur)
|
|
, end(buf->end())
|
|
{}
|
|
inline R const operator()() {
|
|
if (cur == end)
|
|
buf->fill();
|
|
return *cur++;
|
|
}
|
|
generator(generator<R> const & rhs)
|
|
:
|
|
buf(new buffer (*rhs.buf))
|
|
, cur(buf->cur)
|
|
, end(buf->end())
|
|
{}
|
|
generator<R> & operator=(generator<R> rhs) {
|
|
swap(*this, rhs);
|
|
return *this;
|
|
}
|
|
private:
|
|
class buffer: public std::vector<R> {
|
|
public:
|
|
friend class generator<R>;
|
|
template<typename Generator> buffer(Generator const & gen, std::size_t size)
|
|
: std::vector<R>(size)
|
|
, engine(make_shared<Generator>(gen))
|
|
, cur(this->end())
|
|
, fill_helper(lambda::bind(std::generate<typename buffer::iterator, Generator &>, lambda::_1, lambda::_2, ref(*reinterpret_cast<Generator *>(engine.get()))))
|
|
, clone(lambda::bind(buffer::template type_keeper<Generator>, lambda::_1, lambda::_2))
|
|
{}
|
|
template<typename Generator> buffer(reference_wrapper<Generator> gen, std::size_t size)
|
|
: std::vector<R>(size)
|
|
, cur(this->end())
|
|
, fill_helper(lambda::bind(std::generate<typename buffer::iterator, Generator &>, lambda::_1, lambda::_2, gen))
|
|
{}
|
|
buffer(buffer const & rhs)
|
|
: std::vector<R>(rhs)
|
|
, cur(this->begin() + (rhs.cur - rhs.begin()))
|
|
, fill_helper(rhs.fill_helper)
|
|
, clone(rhs.clone)
|
|
{
|
|
if (rhs.engine)
|
|
clone(*this, rhs);
|
|
}
|
|
inline void fill() {
|
|
fill_helper(this->begin(), this->end());
|
|
cur = this->begin();
|
|
}
|
|
private:
|
|
template<typename Generator> static void type_keeper(buffer & lhs, buffer const & rhs) {
|
|
lhs.engine = make_shared<Generator>(*reinterpret_cast<Generator *>(rhs.engine.get()));
|
|
lhs.fill_helper = lambda::bind(std::generate<typename buffer::iterator, Generator &>, lambda::_1, lambda::_2, ref(*reinterpret_cast<Generator *>(lhs.engine.get())));
|
|
}
|
|
shared_ptr<void> engine;
|
|
typename std::vector<R>::const_iterator cur;
|
|
function<void(typename std::vector<R>::iterator, typename std::vector<R>::iterator)> fill_helper;
|
|
function<void(buffer &, buffer const &)> clone;
|
|
};
|
|
|
|
shared_ptr<buffer> buf;
|
|
typename buffer::const_iterator & cur;
|
|
typename buffer::const_iterator end;
|
|
};
|
|
}
|