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+// Copyright 2011 The Kyua Authors.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+//   notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+//   notice, this list of conditions and the following disclaimer in the
+//   documentation and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors
+//   may be used to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/// \file model/context.hpp
+/// Representation of runtime contexts.
+
+#if !defined(MODEL_CONTEXT_HPP)
+#define MODEL_CONTEXT_HPP
+
+#include "model/context_fwd.hpp"
+
+#include <map>
+#include <memory>
+#include <ostream>
+#include <string>
+
+#include "utils/fs/path_fwd.hpp"
+
+namespace model {
+
+
+/// Representation of a runtime context.
+///
+/// The instances of this class are unique (i.e. copying the objects only yields
+/// a shallow copy that shares the same internal implementation).  This is a
+/// requirement for the 'store' API model.
+class context {
+    struct impl;
+
+    /// Pointer to the shared internal implementation.
+    std::shared_ptr< impl > _pimpl;
+
+public:
+    context(const utils::fs::path&,
+            const std::map< std::string, std::string >&);
+    ~context(void);
+
+    const utils::fs::path& cwd(void) const;
+    const std::map< std::string, std::string >& env(void) const;
+
+    bool operator==(const context&) const;
+    bool operator!=(const context&) const;
+};
+
+
+std::ostream& operator<<(std::ostream&, const context&);
+
+
+}  // namespace model
+
+#endif  // !defined(MODEL_CONTEXT_HPP)