273 lines
8.7 KiB
Plaintext
273 lines
8.7 KiB
Plaintext
//
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// Copyright (c) Antony Polukhin, 2013-2015.
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//
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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#ifndef BOOST_TYPE_INDEX_STL_TYPE_INDEX_HPP
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#define BOOST_TYPE_INDEX_STL_TYPE_INDEX_HPP
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/// \file stl_type_index.hpp
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/// \brief Contains boost::typeindex::stl_type_index class.
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///
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/// boost::typeindex::stl_type_index class can be used as a drop-in replacement
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/// for std::type_index.
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///
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/// It is used in situations when RTTI is enabled or typeid() method is available.
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/// When typeid() is disabled or BOOST_TYPE_INDEX_FORCE_NO_RTTI_COMPATIBILITY macro
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/// is defined boost::typeindex::ctti is usually used instead of boost::typeindex::stl_type_index.
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#include <boost/type_index/type_index_facade.hpp>
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// MSVC is capable of calling typeid(T) even when RTTI is off
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#if defined(BOOST_NO_RTTI) && !defined(BOOST_MSVC)
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#error "File boost/type_index/stl_type_index.ipp is not usable when typeid() is not available."
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#endif
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#include <typeinfo>
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#include <cstring> // std::strcmp, std::strlen, std::strstr
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#include <stdexcept>
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#include <boost/static_assert.hpp>
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#include <boost/throw_exception.hpp>
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#include <boost/core/demangle.hpp>
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#include <boost/type_traits/is_const.hpp>
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#include <boost/type_traits/is_reference.hpp>
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#include <boost/type_traits/is_volatile.hpp>
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#include <boost/type_traits/remove_cv.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/or.hpp>
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#if (defined(__EDG_VERSION__) && __EDG_VERSION__ < 245) \
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|| (defined(__sgi) && defined(_COMPILER_VERSION) && _COMPILER_VERSION <= 744)
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# include <boost/type_traits/is_signed.hpp>
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# include <boost/type_traits/make_signed.hpp>
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# include <boost/mpl/identity.hpp>
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#endif
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#ifdef BOOST_HAS_PRAGMA_ONCE
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# pragma once
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#endif
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namespace boost { namespace typeindex {
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/// \class stl_type_index
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/// This class is a wrapper around std::type_info, that workarounds issues and provides
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/// much more rich interface. \b For \b description \b of \b functions \b see type_index_facade.
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///
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/// This class requires typeid() to work. For cases when RTTI is disabled see ctti_type_index.
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class stl_type_index
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: public type_index_facade<
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stl_type_index,
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#ifdef BOOST_NO_STD_TYPEINFO
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type_info
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#else
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std::type_info
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#endif
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>
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{
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public:
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#ifdef BOOST_NO_STD_TYPEINFO
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typedef type_info type_info_t;
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#else
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typedef std::type_info type_info_t;
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#endif
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private:
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const type_info_t* data_;
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public:
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inline stl_type_index() BOOST_NOEXCEPT
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: data_(&typeid(void))
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{}
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inline stl_type_index(const type_info_t& data) BOOST_NOEXCEPT
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: data_(&data)
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{}
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inline const type_info_t& type_info() const BOOST_NOEXCEPT;
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inline const char* raw_name() const BOOST_NOEXCEPT;
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inline const char* name() const BOOST_NOEXCEPT;
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inline std::string pretty_name() const;
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inline std::size_t hash_code() const BOOST_NOEXCEPT;
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inline bool equal(const stl_type_index& rhs) const BOOST_NOEXCEPT;
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inline bool before(const stl_type_index& rhs) const BOOST_NOEXCEPT;
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template <class T>
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inline static stl_type_index type_id() BOOST_NOEXCEPT;
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template <class T>
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inline static stl_type_index type_id_with_cvr() BOOST_NOEXCEPT;
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template <class T>
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inline static stl_type_index type_id_runtime(const T& value) BOOST_NOEXCEPT;
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};
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inline const stl_type_index::type_info_t& stl_type_index::type_info() const BOOST_NOEXCEPT {
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return *data_;
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}
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inline const char* stl_type_index::raw_name() const BOOST_NOEXCEPT {
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#ifdef _MSC_VER
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return data_->raw_name();
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#else
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return data_->name();
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#endif
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}
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inline const char* stl_type_index::name() const BOOST_NOEXCEPT {
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return data_->name();
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}
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inline std::string stl_type_index::pretty_name() const {
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static const char cvr_saver_name[] = "boost::typeindex::detail::cvr_saver<";
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static BOOST_CONSTEXPR_OR_CONST std::string::size_type cvr_saver_name_len = sizeof(cvr_saver_name) - 1;
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// In case of MSVC demangle() is a no-op, and name() already returns demangled name.
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// In case of GCC and Clang (on non-Windows systems) name() returns mangled name and demangle() undecorates it.
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const boost::core::scoped_demangled_name demangled_name(data_->name());
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const char* begin = demangled_name.get();
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if (!begin) {
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boost::throw_exception(std::runtime_error("Type name demangling failed"));
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}
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const std::string::size_type len = std::strlen(begin);
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const char* end = begin + len;
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if (len > cvr_saver_name_len) {
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const char* b = std::strstr(begin, cvr_saver_name);
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if (b) {
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b += cvr_saver_name_len;
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// Trim leading spaces
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while (*b == ' ') { // the string is zero terminated, we won't exceed the buffer size
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++ b;
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}
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// Skip the closing angle bracket
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const char* e = end - 1;
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while (e > b && *e != '>') {
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-- e;
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}
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// Trim trailing spaces
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while (e > b && *(e - 1) == ' ') {
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-- e;
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}
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if (b < e) {
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// Parsing seems to have succeeded, the type name is not empty
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begin = b;
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end = e;
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}
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}
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}
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return std::string(begin, end);
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}
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inline std::size_t stl_type_index::hash_code() const BOOST_NOEXCEPT {
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#if _MSC_VER > 1600 || (__GNUC__ == 4 && __GNUC_MINOR__ > 5 && defined(__GXX_EXPERIMENTAL_CXX0X__))
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return data_->hash_code();
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#else
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return boost::hash_range(raw_name(), raw_name() + std::strlen(raw_name()));
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#endif
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}
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/// @cond
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// for this compiler at least, cross-shared-library type_info
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// comparisons don't work, so we are using typeid(x).name() instead.
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# if (defined(__GNUC__) && (__GNUC__ < 4 || (__GNUC__ == 4 && __GNUC_MINOR__ < 5))) \
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|| defined(_AIX) \
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|| (defined(__sgi) && defined(__host_mips)) \
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|| (defined(__hpux) && defined(__HP_aCC)) \
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|| (defined(linux) && defined(__INTEL_COMPILER) && defined(__ICC))
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# define BOOST_CLASSINFO_COMPARE_BY_NAMES
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# endif
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/// @endcond
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inline bool stl_type_index::equal(const stl_type_index& rhs) const BOOST_NOEXCEPT {
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#ifdef BOOST_CLASSINFO_COMPARE_BY_NAMES
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return raw_name() == rhs.raw_name() || !std::strcmp(raw_name(), rhs.raw_name());
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#else
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return !!(*data_ == *rhs.data_);
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#endif
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}
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inline bool stl_type_index::before(const stl_type_index& rhs) const BOOST_NOEXCEPT {
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#ifdef BOOST_CLASSINFO_COMPARE_BY_NAMES
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return raw_name() != rhs.raw_name() && std::strcmp(raw_name(), rhs.raw_name()) < 0;
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#else
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return !!data_->before(*rhs.data_);
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#endif
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}
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#ifdef BOOST_CLASSINFO_COMPARE_BY_NAMES
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#undef BOOST_CLASSINFO_COMPARE_BY_NAMES
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#endif
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template <class T>
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inline stl_type_index stl_type_index::type_id() BOOST_NOEXCEPT {
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typedef BOOST_DEDUCED_TYPENAME boost::remove_reference<T>::type no_ref_t;
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typedef BOOST_DEDUCED_TYPENAME boost::remove_cv<no_ref_t>::type no_cvr_prefinal_t;
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# if (defined(__EDG_VERSION__) && __EDG_VERSION__ < 245) \
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|| (defined(__sgi) && defined(_COMPILER_VERSION) && _COMPILER_VERSION <= 744)
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// Old EDG-based compilers seem to mistakenly distinguish 'integral' from 'signed integral'
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// in typeid() expressions. Full template specialization for 'integral' fixes that issue:
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typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_<
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boost::is_signed<no_cvr_prefinal_t>,
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boost::make_signed<no_cvr_prefinal_t>,
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boost::mpl::identity<no_cvr_prefinal_t>
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>::type no_cvr_prefinal_lazy_t;
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typedef BOOST_DEDUCED_TYPENAME no_cvr_prefinal_t::type no_cvr_t;
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#else
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typedef no_cvr_prefinal_t no_cvr_t;
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#endif
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return typeid(no_cvr_t);
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}
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namespace detail {
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template <class T> class cvr_saver{};
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}
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template <class T>
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inline stl_type_index stl_type_index::type_id_with_cvr() BOOST_NOEXCEPT {
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typedef BOOST_DEDUCED_TYPENAME boost::mpl::if_<
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boost::mpl::or_<boost::is_reference<T>, boost::is_const<T>, boost::is_volatile<T> >,
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detail::cvr_saver<T>,
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T
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>::type type;
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return typeid(type);
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}
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template <class T>
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inline stl_type_index stl_type_index::type_id_runtime(const T& value) BOOST_NOEXCEPT {
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#ifdef BOOST_NO_RTTI
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return value.boost_type_index_type_id_runtime_();
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#else
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return typeid(value);
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#endif
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}
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}} // namespace boost::typeindex
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#endif // BOOST_TYPE_INDEX_STL_TYPE_INDEX_HPP
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