diff options
Diffstat (limited to '3rdParty/Boost/src/boost/detail/scoped_enum_emulation.hpp')
-rw-r--r-- | 3rdParty/Boost/src/boost/detail/scoped_enum_emulation.hpp | 349 |
1 files changed, 315 insertions, 34 deletions
diff --git a/3rdParty/Boost/src/boost/detail/scoped_enum_emulation.hpp b/3rdParty/Boost/src/boost/detail/scoped_enum_emulation.hpp index e695a20..80394cf 100644 --- a/3rdParty/Boost/src/boost/detail/scoped_enum_emulation.hpp +++ b/3rdParty/Boost/src/boost/detail/scoped_enum_emulation.hpp @@ -1,56 +1,337 @@ // scoped_enum_emulation.hpp ---------------------------------------------------------// // Copyright Beman Dawes, 2009 +// Copyright (C) 2011-2012 Vicente J. Botet Escriba +// Copyright (C) 2012 Anthony Williams // Distributed under the Boost Software License, Version 1.0. // See http://www.boost.org/LICENSE_1_0.txt -// Generates C++0x scoped enums if the feature is present, otherwise emulates C++0x -// scoped enums with C++03 namespaces and enums. The Boost.Config BOOST_NO_SCOPED_ENUMS -// macro is used to detect feature support. -// -// See http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2347.pdf for a -// description of the scoped enum feature. Note that the committee changed the name -// from strongly typed enum to scoped enum. -// -// Caution: only the syntax is emulated; the semantics are not emulated and -// the syntax emulation doesn't include being able to specify the underlying -// representation type. -// -// The emulation is via struct rather than namespace to allow use within classes. -// Thanks to Andrey Semashev for pointing that out. -// -// Helpful comments and suggestions were also made by Kjell Elster, Phil Endecott, -// Joel Falcou, Mathias Gaunard, Felipe Magno de Almeida, Matt Calabrese, Vincente -// Botet, and Daniel James. -// -// Sample usage: -// -// BOOST_SCOPED_ENUM_START(algae) { green, red, cyan }; BOOST_SCOPED_ENUM_END -// ... -// BOOST_SCOPED_ENUM(algae) sample( algae::red ); -// void foo( BOOST_SCOPED_ENUM(algae) color ); -// ... -// sample = algae::green; -// foo( algae::cyan ); +/* +[section:scoped_enums Scoped Enums] + +Generates C++0x scoped enums if the feature is present, otherwise emulates C++0x +scoped enums with C++03 namespaces and enums. The Boost.Config BOOST_NO_SCOPED_ENUMS +macro is used to detect feature support. + +See http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2007/n2347.pdf for a +description of the scoped enum feature. Note that the committee changed the name +from strongly typed enum to scoped enum. + +Some of the enumerations defined in the standard library are scoped enums. + + enum class future_errc + { + broken_promise, + future_already_retrieved, + promise_already_satisfied, + no_state + }; + +On compilers that don't support them, the library provides two emulations: + +[heading Strict] + +* Able to specify the underlying type. +* explicit conversion to/from underlying type. +* The wrapper is not a C++03 enum type. + +The user can declare declare these types as + + BOOST_SCOPED_ENUM_DECLARE_BEGIN(future_errc) + { + broken_promise, + future_already_retrieved, + promise_already_satisfied, + no_state + } + BOOST_SCOPED_ENUM_DECLARE_END(future_errc) + +These macros allows to use 'future_errc' in almost all the cases as an scoped enum. + + future_errc err = future_errc::no_state; + +There are however some limitations: + +* The type is not a C++ enum, so 'is_enum<future_errc>' will be false_type. +* The emulated scoped enum can not be used in switch nor in template arguments. For these cases the user needs to use some macros. + +Instead of + + switch (ev) + { + case future_errc::broken_promise: + // ... + +use + + switch (boost::native_value(ev)) + { + case future_errc::broken_promise: + +And instead of + + #ifdef BOOST_NO_SCOPED_ENUMS + template <> + struct BOOST_SYMBOL_VISIBLE is_error_code_enum<future_errc> : public true_type { }; + #endif + +use + + #ifdef BOOST_NO_SCOPED_ENUMS + template <> + struct BOOST_SYMBOL_VISIBLE is_error_code_enum<future_errc::enum_type > : public true_type { }; + #endif + + +Sample usage: + + BOOST_SCOPED_ENUM_UT_DECLARE_BEGIN(algae, char) { green, red, cyan }; BOOST_SCOPED_ENUM_DECLARE_END(algae) + ... + algae sample( algae::red ); + void foo( algae color ); + ... + sample = algae::green; + foo( algae::cyan ); + + Light + Caution: only the syntax is emulated; the semantics are not emulated and + the syntax emulation doesn't include being able to specify the underlying + representation type. + + The literal scoped emulation is via struct rather than namespace to allow use within classes. + Thanks to Andrey Semashev for pointing that out. + However the type is an real C++03 enum and so convertible implicitly to an int. + + Sample usage: + + BOOST_SCOPED_ENUM_START(algae) { green, red, cyan }; BOOST_SCOPED_ENUM_END + ... + BOOST_SCOPED_ENUM(algae) sample( algae::red ); + void foo( BOOST_SCOPED_ENUM(algae) color ); + ... + sample = algae::green; + foo( algae::cyan ); + + Helpful comments and suggestions were also made by Kjell Elster, Phil Endecott, + Joel Falcou, Mathias Gaunard, Felipe Magno de Almeida, Matt Calabrese, Vicente + Botet, and Daniel James. + +[endsect] +*/ + #ifndef BOOST_SCOPED_ENUM_EMULATION_HPP #define BOOST_SCOPED_ENUM_EMULATION_HPP #include <boost/config.hpp> +#include <boost/detail/workaround.hpp> + +namespace boost +{ #ifdef BOOST_NO_SCOPED_ENUMS + /** + * Meta-function to get the underlying type of a scoped enum. + * + * Requires EnumType must be an enum type or the emulation of a scoped enum + */ + template <typename EnumType> + struct underlying_type + { + /** + * The member typedef type names the underlying type of EnumType. It is EnumType::underlying_type when the EnumType is an emulated scoped enum, + * std::underlying_type<EnumType>::type when the standard library std::underlying_type is provided. + * + * The user will need to specialize it when the compiler supports scoped enums but don't provides std::underlying_type. + */ + typedef typename EnumType::underlying_type type; + }; + + /** + * Meta-function to get the native enum type associated to an enum class or its emulation. + */ + template <typename EnumType> + struct native_type + { + /** + * The member typedef type names the native enum type associated to the scoped enum, + * which is it self if the compiler supports scoped enums or EnumType::enum_type if it is an emulated scoped enum. + */ + typedef typename EnumType::enum_type type; + }; + + /** + * Casts a scoped enum to its underlying type. + * + * This function is useful when working with scoped enum classes, which doens't implicitly convert to the underlying type. + * @param v A scoped enum. + * @returns The underlying type. + * @throws No-throws. + */ + template <typename UnderlyingType, typename EnumType> + UnderlyingType underlying_cast(EnumType v) + { + return v.get_underlying_value_(); + } + + /** + * Casts a scoped enum to its native enum type. + * + * This function is useful to make programs portable when the scoped enum emulation can not be use where native enums can. + * + * EnumType the scoped enum type + * + * @param v A scoped enum. + * @returns The native enum value. + * @throws No-throws. + */ + template <typename EnumType> + inline + typename EnumType::enum_type native_value(EnumType e) + { + return e.native_value_(); + } + +#else // BOOST_NO_SCOPED_ENUMS -# define BOOST_SCOPED_ENUM_START(name) struct name { enum enum_type -# define BOOST_SCOPED_ENUM_END }; -# define BOOST_SCOPED_ENUM(name) name::enum_type + template <typename EnumType> + struct underlying_type + { + //typedef typename std::underlying_type<EnumType>::type type; + }; + + template <typename EnumType> + struct native_type + { + typedef EnumType type; + }; + + template <typename UnderlyingType, typename EnumType> + UnderlyingType underlying_cast(EnumType v) + { + return static_cast<UnderlyingType>(v); + } + + template <typename EnumType> + inline + EnumType native_value(EnumType e) + { + return e; + } + +#endif +} + + +#ifdef BOOST_NO_SCOPED_ENUMS + +#ifndef BOOST_NO_EXPLICIT_CONVERSION_OPERATORS + +#define BOOST_SCOPED_ENUM_UT_DECLARE_CONVERSION_OPERATOR \ + explicit operator underlying_type() const { return get_underlying_value_(); } #else -# define BOOST_SCOPED_ENUM_START(name) enum class name -# define BOOST_SCOPED_ENUM_END -# define BOOST_SCOPED_ENUM(name) name +#define BOOST_SCOPED_ENUM_UT_DECLARE_CONVERSION_OPERATOR #endif +/** + * Start a declaration of a scoped enum. + * + * @param EnumType The new scoped enum. + * @param UnderlyingType The underlying type. + */ +#define BOOST_SCOPED_ENUM_UT_DECLARE_BEGIN(EnumType, UnderlyingType) \ + struct EnumType { \ + typedef UnderlyingType underlying_type; \ + EnumType() BOOST_NOEXCEPT {} \ + explicit EnumType(underlying_type v) : v_(v) {} \ + underlying_type get_underlying_value_() const { return v_; } \ + BOOST_SCOPED_ENUM_UT_DECLARE_CONVERSION_OPERATOR \ + private: \ + underlying_type v_; \ + typedef EnumType self_type; \ + public: \ + enum enum_type + +#define BOOST_SCOPED_ENUM_DECLARE_END2() \ + enum_type get_native_value_() const BOOST_NOEXCEPT { return enum_type(v_); } \ + operator enum_type() const BOOST_NOEXCEPT { return get_native_value_(); } \ + friend bool operator ==(self_type lhs, self_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)==enum_type(rhs.v_); } \ + friend bool operator ==(self_type lhs, enum_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)==rhs; } \ + friend bool operator ==(enum_type lhs, self_type rhs) BOOST_NOEXCEPT { return lhs==enum_type(rhs.v_); } \ + friend bool operator !=(self_type lhs, self_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)!=enum_type(rhs.v_); } \ + friend bool operator !=(self_type lhs, enum_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)!=rhs; } \ + friend bool operator !=(enum_type lhs, self_type rhs) BOOST_NOEXCEPT { return lhs!=enum_type(rhs.v_); } \ + friend bool operator <(self_type lhs, self_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)<enum_type(rhs.v_); } \ + friend bool operator <(self_type lhs, enum_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)<rhs; } \ + friend bool operator <(enum_type lhs, self_type rhs) BOOST_NOEXCEPT { return lhs<enum_type(rhs.v_); } \ + friend bool operator <=(self_type lhs, self_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)<=enum_type(rhs.v_); } \ + friend bool operator <=(self_type lhs, enum_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)<=rhs; } \ + friend bool operator <=(enum_type lhs, self_type rhs) BOOST_NOEXCEPT { return lhs<=enum_type(rhs.v_); } \ + friend bool operator >(self_type lhs, self_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)>enum_type(rhs.v_); } \ + friend bool operator >(self_type lhs, enum_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)>rhs; } \ + friend bool operator >(enum_type lhs, self_type rhs) BOOST_NOEXCEPT { return lhs>enum_type(rhs.v_); } \ + friend bool operator >=(self_type lhs, self_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)>=enum_type(rhs.v_); } \ + friend bool operator >=(self_type lhs, enum_type rhs) BOOST_NOEXCEPT { return enum_type(lhs.v_)>=rhs; } \ + friend bool operator >=(enum_type lhs, self_type rhs) BOOST_NOEXCEPT { return lhs>=enum_type(rhs.v_); } \ + }; + +#define BOOST_SCOPED_ENUM_DECLARE_END(EnumType) \ + ; \ + EnumType(enum_type v) BOOST_NOEXCEPT : v_(v) {} \ + BOOST_SCOPED_ENUM_DECLARE_END2() + +/** + * Starts a declaration of a scoped enum with the default int underlying type. + * + * @param EnumType The new scoped enum. + */ +#define BOOST_SCOPED_ENUM_DECLARE_BEGIN(EnumType) \ + BOOST_SCOPED_ENUM_UT_DECLARE_BEGIN(EnumType,int) + +/** + * Name of the native enum type. + * + * @param NT The new scoped enum. + */ +#define BOOST_SCOPED_ENUM_NATIVE(EnumType) EnumType::enum_type +/** + * Forward declares an scoped enum. + * + * @param NT The scoped enum. + */ +#define BOOST_SCOPED_ENUM_FORWARD_DECLARE(EnumType) struct EnumType + +#else // BOOST_NO_SCOPED_ENUMS + +#define BOOST_SCOPED_ENUM_UT_DECLARE_BEGIN(EnumType,UnderlyingType) enum class EnumType:UnderlyingType +#define BOOST_SCOPED_ENUM_DECLARE_BEGIN(EnumType) enum class EnumType +#define BOOST_SCOPED_ENUM_DECLARE_END2() +#define BOOST_SCOPED_ENUM_DECLARE_END(EnumType) ; + +#define BOOST_SCOPED_ENUM_NATIVE(EnumType) EnumType +#define BOOST_SCOPED_ENUM_FORWARD_DECLARE(EnumType) enum class EnumType + +#endif // BOOST_NO_SCOPED_ENUMS + +#define BOOST_SCOPED_ENUM_START(name) BOOST_SCOPED_ENUM_DECLARE_BEGIN(name) +#define BOOST_SCOPED_ENUM_END BOOST_SCOPED_ENUM_DECLARE_END2() +#define BOOST_SCOPED_ENUM(name) BOOST_SCOPED_ENUM_NATIVE(name) + +//#ifdef BOOST_NO_SCOPED_ENUMS +// +//# define BOOST_SCOPED_ENUM_START(name) struct name { enum enum_type +//# define BOOST_SCOPED_ENUM_END }; +//# define BOOST_SCOPED_ENUM(name) name::enum_type +// +//#else +// +//# define BOOST_SCOPED_ENUM_START(name) enum class name +//# define BOOST_SCOPED_ENUM_END +//# define BOOST_SCOPED_ENUM(name) name +// +//#endif #endif // BOOST_SCOPED_ENUM_EMULATION_HPP |