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+// file      : openssl/types.hxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2018 Code Synthesis Ltd
+// license   : MIT; see accompanying LICENSE file
+
+#ifndef OPENSSL_TYPES_HXX
+#define OPENSSL_TYPES_HXX
+
+#include <vector>
+#include <string>
+#include <memory>        // unique_ptr, shared_ptr
+#include <cstddef>       // size_t, nullptr_t
+#include <cstdint>       // uint{8,16,32,64}_t
+#include <istream>
+#include <ostream>
+
+#include <ios>           // ios_base::failure
+#include <exception>     // exception
+#include <stdexcept>     // logic_error, invalid_argument, runtime_error
+#include <system_error>
+
+#include <libbutl/path.mxx>
+#include <libbutl/path-io.mxx>
+#include <libbutl/optional.mxx>
+#include <libbutl/fdstream.mxx>
+#include <libbutl/small-vector.mxx>
+
+namespace openssl
+{
+  // Commonly-used types.
+  //
+  using std::uint8_t;
+  using std::uint16_t;
+  using std::uint32_t;
+  using std::uint64_t;
+
+  using std::size_t;
+  using std::nullptr_t;
+
+  using std::pair;
+  using std::string;
+  using std::function;
+  using std::reference_wrapper;
+
+  using std::unique_ptr;
+  using std::shared_ptr;
+  using std::weak_ptr;
+
+  using std::vector;
+  using butl::small_vector; // <libbutl/small-vector.mxx>
+
+  using strings = vector<string>;
+  using cstrings = vector<const char*>;
+
+  using std::istream;
+  using std::ostream;
+
+  // Exceptions. While <exception> is included, there is no using for
+  // std::exception -- use qualified.
+  //
+  using std::logic_error;
+  using std::invalid_argument;
+  using std::runtime_error;
+  using std::system_error;
+  using io_error = std::ios_base::failure;
+
+  // <libbutl/optional.mxx>
+  //
+  using butl::optional;
+  using butl::nullopt;
+
+  // <libbutl/path.mxx>
+  //
+  using butl::path;
+  using butl::dir_path;
+  using butl::basic_path;
+  using butl::invalid_path;
+
+  using butl::path_cast;
+
+  // <libbutl/fdstream.mxx>
+  //
+  using butl::auto_fd;
+  using butl::ifdstream;
+  using butl::ofdstream;
+  using butl::fdopen_mode;
+  using butl::fdstream_mode;
+
+  // Simulation outcomes.
+  //
+  enum class simulate_outcome
+  {
+    success,
+    failure
+  };
+
+  string
+  to_string (simulate_outcome);
+
+  simulate_outcome
+  to_simulate_outcome (const string&); // Throws invalid_argument.
+}
+
+#endif // OPENSSL_TYPES_HXX