minix/external/bsd/kyua-cli/dist/utils/optional.hpp
Lionel Sambuc 11be35a165 Importing NetBSD "Kyua" test framework
To do so, a few dependencies have been imported:

 * external/bsd/lutok
 * external/mit/lua
 * external/public-domain/sqlite
 * external/public-domain/xz

The Kyua framework is the new generation of ATF (Automated Test
Framework), it is composed of:

 * external/bsd/atf
 * external/bsd/kyua-atf-compat
 * external/bsd/kyua-cli
 * external/bsd/kyua-tester
 * tests

Kyua/ATF being written in C++, it depends on libstdc++ which is
provided by GCC. As this is not part of the sources, Kyua is only
compiled when the native GCC utils are installed.

To install Kyua do the following:

 * In a cross-build enviromnent, add the following to the build.sh
   commandline: -V MKBINUTILS=yes -V MKGCCCMDS=yes

WARNING:
  At this point the import is still experimental, and not supported
  on native builds (a.k.a make build).

Change-Id: I26aee23c5bbd2d64adcb7c1beb98fe0d479d7ada
2013-07-23 20:43:41 +02:00

108 lines
3.3 KiB
C++

// Copyright 2010 Google Inc.
// 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
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//
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/// \file utils/optional.hpp
/// Provides the utils::optional class.
///
/// The class is provided as a separate module on its own to minimize
/// header-inclusion side-effects.
#if !defined(UTILS_OPTIONAL_HPP)
#define UTILS_OPTIONAL_HPP
#include <ostream>
namespace utils {
namespace detail {
/// Internal type-safe representation for the none type.
struct none_t {};
} // namespace detail
/// The none value.
///
/// This has internal linkage so it is OK to define it in the header file.
/// However, pointers to none from different translation units will be
/// different. Just don't do that.
const detail::none_t none = {};
/// Holds a data value or none.
///
/// This class allows users to represent values that may be uninitialized.
/// Instead of having to keep separate variables to track whether a variable is
/// supposed to have a value or not, this class allows multiplexing the
/// behaviors.
///
/// This class is a simplified version of Boost.Optional.
template< class T >
class optional {
/// Internal representation of the optional data value.
T* _data;
public:
optional(void);
optional(utils::detail::none_t);
optional(const optional< T >&);
explicit optional(const T&);
~optional(void);
optional& operator=(utils::detail::none_t);
optional& operator=(const T&);
optional& operator=(const optional< T >&);
bool operator==(const optional< T >&) const;
bool operator!=(const optional< T >&) const;
operator bool(void) const;
const T& get(void) const;
const T& get_default(const T&) const;
T& get(void);
};
template< class T >
std::ostream& operator<<(std::ostream&, const optional< T >&);
template< class T >
optional< T > make_optional(const T&);
} // namespace utils
#endif // !defined(UTILS_OPTIONAL_HPP)