mirror of
https://git.suyu.dev/suyu/suyu.git
synced 2024-11-05 22:42:46 +01:00
389 lines
11 KiB
C++
389 lines
11 KiB
C++
|
//-----------------------------------------------------------------------------
|
||
|
|
// boost variant/get.hpp header file
|
||
|
|
// See http://www.boost.org for updates, documentation, and revision history.
|
||
|
|
//-----------------------------------------------------------------------------
|
||
|
|
//
|
||
|
|
// Copyright (c) 2003 Eric Friedman, Itay Maman
|
||
|
|
// Copyright (c) 2014-2022 Antony Polukhin
|
||
|
|
//
|
||
|
|
// Distributed under the Boost Software License, Version 1.0. (See
|
||
|
|
// accompanying file LICENSE_1_0.txt or copy at
|
||
|
|
// http://www.boost.org/LICENSE_1_0.txt)
|
||
|
|
|
||
|
|
#ifndef BOOST_VARIANT_GET_HPP
|
||
|
|
#define BOOST_VARIANT_GET_HPP
|
||
|
|
|
||
|
|
#include <exception>
|
||
|
|
|
||
|
|
#include <boost/config.hpp>
|
||
|
|
#include <boost/detail/workaround.hpp>
|
||
|
|
#include <boost/static_assert.hpp>
|
||
|
|
#include <boost/throw_exception.hpp>
|
||
|
|
#include <boost/utility/addressof.hpp>
|
||
|
|
#include <boost/variant/variant_fwd.hpp>
|
||
|
|
#include <boost/variant/detail/element_index.hpp>
|
||
|
|
#include <boost/variant/detail/move.hpp>
|
||
|
|
|
||
|
|
#include <boost/type_traits/add_reference.hpp>
|
||
|
|
#include <boost/type_traits/add_pointer.hpp>
|
||
|
|
#include <boost/type_traits/is_lvalue_reference.hpp>
|
||
|
|
|
||
|
|
namespace boost {
|
||
|
|
|
||
|
|
#if defined(BOOST_CLANG)
|
||
|
|
# pragma clang diagnostic push
|
||
|
|
# pragma clang diagnostic ignored "-Wweak-vtables"
|
||
|
|
#endif
|
||
|
|
//////////////////////////////////////////////////////////////////////////
|
||
|
|
// class bad_get
|
||
|
|
//
|
||
|
|
// The exception thrown in the event of a failed get of a value.
|
||
|
|
//
|
||
|
|
class BOOST_SYMBOL_VISIBLE bad_get
|
||
|
|
: public std::exception
|
||
|
|
{
|
||
|
|
public: // std::exception implementation
|
||
|
|
|
||
|
|
const char * what() const BOOST_NOEXCEPT_OR_NOTHROW BOOST_OVERRIDE
|
||
|
|
{
|
||
|
|
return "boost::bad_get: "
|
||
|
|
"failed value get using boost::get";
|
||
|
|
}
|
||
|
|
|
||
|
|
};
|
||
|
|
#if defined(BOOST_CLANG)
|
||
|
|
# pragma clang diagnostic pop
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
//////////////////////////////////////////////////////////////////////////
|
||
|
|
// function template get<T>
|
||
|
|
//
|
||
|
|
// Retrieves content of given variant object if content is of type T.
|
||
|
|
// Otherwise: pointer ver. returns 0; reference ver. throws bad_get.
|
||
|
|
//
|
||
|
|
|
||
|
|
namespace detail { namespace variant {
|
||
|
|
|
||
|
|
// (detail) class template get_visitor
|
||
|
|
//
|
||
|
|
// Generic static visitor that: if the value is of the specified type,
|
||
|
|
// returns a pointer to the value it visits; else a null pointer.
|
||
|
|
//
|
||
|
|
template <typename T>
|
||
|
|
struct get_visitor
|
||
|
|
{
|
||
|
|
private: // private typedefs
|
||
|
|
|
||
|
|
typedef typename add_pointer<T>::type pointer;
|
||
|
|
typedef typename add_reference<T>::type reference;
|
||
|
|
|
||
|
|
public: // visitor typedefs
|
||
|
|
|
||
|
|
typedef pointer result_type;
|
||
|
|
|
||
|
|
public: // visitor interfaces
|
||
|
|
|
||
|
|
pointer operator()(reference operand) const BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
return boost::addressof(operand);
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename U>
|
||
|
|
pointer operator()(const U&) const BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
return static_cast<pointer>(0);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
|
||
|
|
}} // namespace detail::variant
|
||
|
|
|
||
|
|
#ifndef BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE
|
||
|
|
# if !BOOST_WORKAROUND(BOOST_BORLANDC, BOOST_TESTED_AT(0x0551))
|
||
|
|
# define BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(t)
|
||
|
|
# else
|
||
|
|
# if defined(BOOST_NO_CXX11_NULLPTR)
|
||
|
|
# define BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(t) \
|
||
|
|
, t* = 0
|
||
|
|
# else
|
||
|
|
# define BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(t) \
|
||
|
|
, t* = nullptr
|
||
|
|
# endif
|
||
|
|
# endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
|
||
|
|
// relaxed_get<U>(variant) methods
|
||
|
|
//
|
||
|
|
template <typename U, BOOST_VARIANT_ENUM_PARAMS(typename T) >
|
||
|
|
inline
|
||
|
|
typename add_pointer<U>::type
|
||
|
|
relaxed_get(
|
||
|
|
boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >* operand
|
||
|
|
BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(U)
|
||
|
|
) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
typedef typename add_pointer<U>::type U_ptr;
|
||
|
|
if (!operand) return static_cast<U_ptr>(0);
|
||
|
|
|
||
|
|
detail::variant::get_visitor<U> v;
|
||
|
|
return operand->apply_visitor(v);
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename U, BOOST_VARIANT_ENUM_PARAMS(typename T) >
|
||
|
|
inline
|
||
|
|
typename add_pointer<const U>::type
|
||
|
|
relaxed_get(
|
||
|
|
const boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >* operand
|
||
|
|
BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(U)
|
||
|
|
) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
typedef typename add_pointer<const U>::type U_ptr;
|
||
|
|
if (!operand) return static_cast<U_ptr>(0);
|
||
|
|
|
||
|
|
detail::variant::get_visitor<const U> v;
|
||
|
|
return operand->apply_visitor(v);
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename U, BOOST_VARIANT_ENUM_PARAMS(typename T) >
|
||
|
|
inline
|
||
|
|
typename add_reference<U>::type
|
||
|
|
relaxed_get(
|
||
|
|
boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >& operand
|
||
|
|
BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(U)
|
||
|
|
)
|
||
|
|
{
|
||
|
|
typedef typename add_pointer<U>::type U_ptr;
|
||
|
|
U_ptr result = relaxed_get<U>(boost::addressof(operand));
|
||
|
|
|
||
|
|
if (!result)
|
||
|
|
boost::throw_exception(bad_get());
|
||
|
|
return *result;
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename U, BOOST_VARIANT_ENUM_PARAMS(typename T) >
|
||
|
|
inline
|
||
|
|
typename add_reference<const U>::type
|
||
|
|
relaxed_get(
|
||
|
|
const boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >& operand
|
||
|
|
BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(U)
|
||
|
|
)
|
||
|
|
{
|
||
|
|
typedef typename add_pointer<const U>::type U_ptr;
|
||
|
|
U_ptr result = relaxed_get<const U>(boost::addressof(operand));
|
||
|
|
|
||
|
|
if (!result)
|
||
|
|
boost::throw_exception(bad_get());
|
||
|
|
return *result;
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
|
||
|
|
|
||
|
|
#if defined(BOOST_MSVC) && (_MSC_VER < 1900) // MSVC-2014 has fixed the incorrect diagnostics.
|
||
|
|
# pragma warning(push)
|
||
|
|
# pragma warning(disable: 4172) // returning address of local variable or temporary
|
||
|
|
#endif
|
||
|
|
|
||
|
|
template <typename U, BOOST_VARIANT_ENUM_PARAMS(typename T) >
|
||
|
|
inline
|
||
|
|
U&&
|
||
|
|
relaxed_get(
|
||
|
|
boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >&& operand
|
||
|
|
BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(U)
|
||
|
|
)
|
||
|
|
{
|
||
|
|
typedef typename add_pointer<U>::type U_ptr;
|
||
|
|
U_ptr result = relaxed_get<U>(boost::addressof(operand));
|
||
|
|
|
||
|
|
if (!result)
|
||
|
|
boost::throw_exception(bad_get());
|
||
|
|
return static_cast<U&&>(*result);
|
||
|
|
}
|
||
|
|
|
||
|
|
#if defined(BOOST_MSVC) && (_MSC_VER < 1900)
|
||
|
|
# pragma warning(pop)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
|
||
|
|
// strict_get<U>(variant) methods
|
||
|
|
//
|
||
|
|
template <typename U, BOOST_VARIANT_ENUM_PARAMS(typename T) >
|
||
|
|
inline
|
||
|
|
typename add_pointer<U>::type
|
||
|
|
strict_get(
|
||
|
|
boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >* operand
|
||
|
|
BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(U)
|
||
|
|
) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
BOOST_STATIC_ASSERT_MSG(
|
||
|
|
(boost::detail::variant::holds_element<boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >, U >::value),
|
||
|
|
"boost::variant does not contain specified type U, "
|
||
|
|
"call to boost::get<U>(boost::variant<T...>*) will always return NULL"
|
||
|
|
);
|
||
|
|
|
||
|
|
return relaxed_get<U>(operand);
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename U, BOOST_VARIANT_ENUM_PARAMS(typename T) >
|
||
|
|
inline
|
||
|
|
typename add_pointer<const U>::type
|
||
|
|
strict_get(
|
||
|
|
const boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >* operand
|
||
|
|
BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(U)
|
||
|
|
) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
BOOST_STATIC_ASSERT_MSG(
|
||
|
|
(boost::detail::variant::holds_element<boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >, const U >::value),
|
||
|
|
"boost::variant does not contain specified type U, "
|
||
|
|
"call to boost::get<U>(const boost::variant<T...>*) will always return NULL"
|
||
|
|
);
|
||
|
|
|
||
|
|
return relaxed_get<U>(operand);
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename U, BOOST_VARIANT_ENUM_PARAMS(typename T) >
|
||
|
|
inline
|
||
|
|
typename add_reference<U>::type
|
||
|
|
strict_get(
|
||
|
|
boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >& operand
|
||
|
|
BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(U)
|
||
|
|
)
|
||
|
|
{
|
||
|
|
BOOST_STATIC_ASSERT_MSG(
|
||
|
|
(boost::detail::variant::holds_element<boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >, U >::value),
|
||
|
|
"boost::variant does not contain specified type U, "
|
||
|
|
"call to boost::get<U>(boost::variant<T...>&) will always throw boost::bad_get exception"
|
||
|
|
);
|
||
|
|
|
||
|
|
return relaxed_get<U>(operand);
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename U, BOOST_VARIANT_ENUM_PARAMS(typename T) >
|
||
|
|
inline
|
||
|
|
typename add_reference<const U>::type
|
||
|
|
strict_get(
|
||
|
|
const boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >& operand
|
||
|
|
BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(U)
|
||
|
|
)
|
||
|
|
{
|
||
|
|
BOOST_STATIC_ASSERT_MSG(
|
||
|
|
(boost::detail::variant::holds_element<boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >, const U >::value),
|
||
|
|
"boost::variant does not contain specified type U, "
|
||
|
|
"call to boost::get<U>(const boost::variant<T...>&) will always throw boost::bad_get exception"
|
||
|
|
);
|
||
|
|
|
||
|
|
return relaxed_get<U>(operand);
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
|
||
|
|
template <typename U, BOOST_VARIANT_ENUM_PARAMS(typename T) >
|
||
|
|
inline
|
||
|
|
U&&
|
||
|
|
strict_get(
|
||
|
|
boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >&& operand
|
||
|
|
BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(U)
|
||
|
|
)
|
||
|
|
{
|
||
|
|
BOOST_STATIC_ASSERT_MSG(
|
||
|
|
(!boost::is_lvalue_reference<U>::value),
|
||
|
|
"remove ampersand '&' from template type U in boost::get<U>(boost::variant<T...>&&) "
|
||
|
|
);
|
||
|
|
|
||
|
|
BOOST_STATIC_ASSERT_MSG(
|
||
|
|
(boost::detail::variant::holds_element<boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >, U >::value),
|
||
|
|
"boost::variant does not contain specified type U, "
|
||
|
|
"call to boost::get<U>(const boost::variant<T...>&) will always throw boost::bad_get exception"
|
||
|
|
);
|
||
|
|
|
||
|
|
return relaxed_get<U>(detail::variant::move(operand));
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
/////////////////////////////////////////////////////////////////////////////////////////////////////////////
|
||
|
|
// get<U>(variant) methods
|
||
|
|
//
|
||
|
|
|
||
|
|
template <typename U, BOOST_VARIANT_ENUM_PARAMS(typename T) >
|
||
|
|
inline
|
||
|
|
typename add_pointer<U>::type
|
||
|
|
get(
|
||
|
|
boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >* operand
|
||
|
|
BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(U)
|
||
|
|
) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
#ifdef BOOST_VARIANT_USE_RELAXED_GET_BY_DEFAULT
|
||
|
|
return relaxed_get<U>(operand);
|
||
|
|
#else
|
||
|
|
return strict_get<U>(operand);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename U, BOOST_VARIANT_ENUM_PARAMS(typename T) >
|
||
|
|
inline
|
||
|
|
typename add_pointer<const U>::type
|
||
|
|
get(
|
||
|
|
const boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >* operand
|
||
|
|
BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(U)
|
||
|
|
) BOOST_NOEXCEPT
|
||
|
|
{
|
||
|
|
#ifdef BOOST_VARIANT_USE_RELAXED_GET_BY_DEFAULT
|
||
|
|
return relaxed_get<U>(operand);
|
||
|
|
#else
|
||
|
|
return strict_get<U>(operand);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename U, BOOST_VARIANT_ENUM_PARAMS(typename T) >
|
||
|
|
inline
|
||
|
|
typename add_reference<U>::type
|
||
|
|
get(
|
||
|
|
boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >& operand
|
||
|
|
BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(U)
|
||
|
|
)
|
||
|
|
{
|
||
|
|
#ifdef BOOST_VARIANT_USE_RELAXED_GET_BY_DEFAULT
|
||
|
|
return relaxed_get<U>(operand);
|
||
|
|
#else
|
||
|
|
return strict_get<U>(operand);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
template <typename U, BOOST_VARIANT_ENUM_PARAMS(typename T) >
|
||
|
|
inline
|
||
|
|
typename add_reference<const U>::type
|
||
|
|
get(
|
||
|
|
const boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >& operand
|
||
|
|
BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(U)
|
||
|
|
)
|
||
|
|
{
|
||
|
|
#ifdef BOOST_VARIANT_USE_RELAXED_GET_BY_DEFAULT
|
||
|
|
return relaxed_get<U>(operand);
|
||
|
|
#else
|
||
|
|
return strict_get<U>(operand);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
|
||
|
|
template <typename U, BOOST_VARIANT_ENUM_PARAMS(typename T) >
|
||
|
|
inline
|
||
|
|
U&&
|
||
|
|
get(
|
||
|
|
boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >&& operand
|
||
|
|
BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(U)
|
||
|
|
)
|
||
|
|
{
|
||
|
|
#ifdef BOOST_VARIANT_USE_RELAXED_GET_BY_DEFAULT
|
||
|
|
return relaxed_get<U>(detail::variant::move(operand));
|
||
|
|
#else
|
||
|
|
return strict_get<U>(detail::variant::move(operand));
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
} // namespace boost
|
||
|
|
|
||
|
|
#endif // BOOST_VARIANT_GET_HPP
|