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/****************************************************************************** |
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* Top contributors (to current version): |
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* Gereon Kremer |
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* |
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* This file is part of the cvc5 project. |
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* |
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* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS |
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* in the top-level source directory and their institutional affiliations. |
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* All rights reserved. See the file COPYING in the top-level source |
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* directory for licensing information. |
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* **************************************************************************** |
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* |
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* Wrappers to handle memory management of streams. |
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* |
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* This file contains wrappers to handle special cases of managing memory |
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* related to streams stored in options. |
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*/ |
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#include "cvc5_public.h" |
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#ifndef CVC5__OPTIONS__MANAGED_STREAMS_H |
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#define CVC5__OPTIONS__MANAGED_STREAMS_H |
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#include <memory> |
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#include <ostream> |
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namespace cvc5 { |
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namespace detail { |
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/* |
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* Open a file as an output stream and return it as a pointer. The caller |
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* assumes the ownership of the returned pointer. |
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*/ |
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std::ostream* openOStream(const std::string& filename); |
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/* |
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* Open a file as an input stream and return it as a pointer. The caller |
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* assumes the ownership of the returned pointer. |
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*/ |
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std::istream* openIStream(const std::string& filename); |
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} // namespace detail |
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/** |
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* Implements memory management for streams, both input and output. It is |
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* intended to be subclassed, where a subclass can provide a default value and |
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* special cases. Usually, users should use one of these subclasses. |
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* The template argument type should be either std::istream or std::ostream, |
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* indicating whether the type wraps an input or output stream. |
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*/ |
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template <typename Stream> |
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class ManagedStream |
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{ |
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public: |
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ManagedStream() {} |
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virtual ~ManagedStream() {} |
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/** |
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* Open the stream from the given value. First check the special cases and |
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* then fall back to using `std::ofstream` or `std::ifstream`. |
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*/ |
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void open(const std::string& value) |
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{ |
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if (specialCases(value)) return; |
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if constexpr (std::is_same<Stream, std::ostream>::value) |
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{ |
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d_stream.reset(detail::openOStream(value)); |
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} |
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else if constexpr (std::is_same<Stream, std::istream>::value) |
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{ |
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d_stream.reset(detail::openIStream(value)); |
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} |
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} |
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Stream& operator*() const { return *getPtr(); } |
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Stream* operator->() const { return getPtr(); } |
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operator Stream&() const { return *getPtr(); } |
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operator Stream*() const { return getPtr(); } |
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protected: |
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std::shared_ptr<Stream> d_stream; |
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private: |
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/** Returns the value to be used if d_stream is not set. */ |
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virtual Stream* defaultValue() const = 0; |
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/** |
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* Check if there is a special case for this value. If so, the implementation |
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* should set d_stream appropriately and return true to skip the default |
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* methods for opening a stream. |
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*/ |
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virtual bool specialCases(const std::string& value) = 0; |
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/** Return the pointer, either from d_stream of from defaultValue(). */ |
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Stream* getPtr() const |
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{ |
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if (d_stream) return d_stream.get(); |
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return defaultValue(); |
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} |
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}; |
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template <typename Stream> |
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std::ostream& operator<<(std::ostream& os, const ManagedStream<Stream>& ms) |
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{ |
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return os << "ManagedStream"; |
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} |
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/** |
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* Managed error output. It recognizes "stderr" and "--" as special valued for |
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* std::cerr. |
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*/ |
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class ManagedErr : public ManagedStream<std::ostream> |
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{ |
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std::ostream* defaultValue() const override final; |
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bool specialCases(const std::string& value) override final; |
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}; |
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/** |
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* Managed standard input. It recognizes "stdin" and "--" as special valued for |
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* std::cin. |
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*/ |
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class ManagedIn : public ManagedStream<std::istream> |
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{ |
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std::istream* defaultValue() const override final; |
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bool specialCases(const std::string& value) override final; |
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}; |
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/** |
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* Managed standard output. It recognizes "stdout" and "--" as special valued |
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* for std::cout. |
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*/ |
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class ManagedOut : public ManagedStream<std::ostream> |
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{ |
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std::ostream* defaultValue() const override final; |
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bool specialCases(const std::string& value) override final; |
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}; |
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} // namespace cvc5 |
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#endif /* CVC5__OPTIONS__MANAGED_STREAMS_H */ |