90 lines
2.3 KiB
C++
90 lines
2.3 KiB
C++
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// (C) Copyright Jeremy Siek 2001.
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// Revision History:
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// 27 Feb 2001 Jeremy Siek
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// Initial checkin.
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#ifndef BOOST_ITERATOR_FUNCTION_OUTPUT_ITERATOR_HPP_INCLUDED_
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#define BOOST_ITERATOR_FUNCTION_OUTPUT_ITERATOR_HPP_INCLUDED_
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#include <cstddef>
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#include <iterator>
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#include <type_traits>
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namespace boost {
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namespace iterators {
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template< typename UnaryFunction >
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class function_output_iterator
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{
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private:
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class output_proxy
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{
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public:
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explicit output_proxy(UnaryFunction& f) noexcept :
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m_f(f)
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{}
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template< typename T >
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typename std::enable_if<
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!std::is_same< typename std::remove_cv< typename std::remove_reference< T >::type >::type, output_proxy >::value,
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output_proxy const&
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>::type operator=(T&& value) const
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{
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m_f(static_cast< T&& >(value));
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return *this;
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}
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output_proxy(output_proxy const& that) = default;
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output_proxy& operator=(output_proxy const&) = delete;
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private:
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UnaryFunction& m_f;
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};
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public:
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using iterator_category = std::output_iterator_tag;
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using value_type = void;
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using difference_type = std::ptrdiff_t;
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using pointer = void;
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using reference = void;
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template<
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bool Requires = std::is_class< UnaryFunction >::value,
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typename = typename std::enable_if< Requires >::type
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>
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function_output_iterator() :
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m_f()
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{}
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explicit function_output_iterator(UnaryFunction const& f) :
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m_f(f)
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{}
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output_proxy operator*() { return output_proxy(m_f); }
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function_output_iterator& operator++() { return *this; }
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function_output_iterator& operator++(int) { return *this; }
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private:
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UnaryFunction m_f;
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};
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template< typename UnaryFunction >
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inline function_output_iterator< UnaryFunction > make_function_output_iterator(UnaryFunction const& f = UnaryFunction())
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{
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return function_output_iterator< UnaryFunction >(f);
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}
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} // namespace iterators
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using iterators::function_output_iterator;
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using iterators::make_function_output_iterator;
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} // namespace boost
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#endif // BOOST_ITERATOR_FUNCTION_OUTPUT_ITERATOR_HPP_INCLUDED_
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