mirror of
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266 lines
10 KiB
C++
266 lines
10 KiB
C++
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//
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// Copyright (c) Antony Polukhin, 2012-2014.
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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_HPP
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#define BOOST_TYPE_INDEX_HPP
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/// \file boost/type_index.hpp
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/// \brief Includes minimal set of headers required to use the Boost.TypeIndex library.
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///
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/// By inclusion of this file most optimal type index classes will be included and used
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/// as a boost::typeindex::type_index and boost::typeindex::type_info.
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#include <boost/config.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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# pragma once
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#endif
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#if defined(BOOST_TYPE_INDEX_USER_TYPEINDEX)
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# include BOOST_TYPE_INDEX_USER_TYPEINDEX
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# ifdef BOOST_HAS_PRAGMA_DETECT_MISMATCH
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# pragma detect_mismatch( "boost__type_index__abi", "user defined type_index class is used: " BOOST_STRINGIZE(BOOST_TYPE_INDEX_USER_TYPEINDEX))
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# endif
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#elif (!defined(BOOST_NO_RTTI) && !defined(BOOST_TYPE_INDEX_FORCE_NO_RTTI_COMPATIBILITY)) || defined(BOOST_MSVC)
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# include <boost/type_index/stl_type_index.hpp>
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# ifdef BOOST_NO_RTTI
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# include <boost/type_index/detail/stl_register_class.hpp>
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# ifdef BOOST_HAS_PRAGMA_DETECT_MISMATCH
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# pragma detect_mismatch( "boost__type_index__abi", "RTTI is off - typeid() is used only for templates")
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# endif
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# else
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# ifdef BOOST_HAS_PRAGMA_DETECT_MISMATCH
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# pragma detect_mismatch( "boost__type_index__abi", "RTTI is used")
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# endif
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# endif
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#else
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# include <boost/type_index/ctti_type_index.hpp>
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# include <boost/type_index/detail/ctti_register_class.hpp>
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# ifdef BOOST_HAS_PRAGMA_DETECT_MISMATCH
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# pragma detect_mismatch( "boost__type_index__abi", "RTTI is off - using CTTI")
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# endif
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#endif
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#ifndef BOOST_TYPE_INDEX_REGISTER_CLASS
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#define BOOST_TYPE_INDEX_REGISTER_CLASS
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#endif
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namespace boost { namespace typeindex {
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#if defined(BOOST_TYPE_INDEX_DOXYGEN_INVOKED)
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/// \def BOOST_TYPE_INDEX_FUNCTION_SIGNATURE
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/// BOOST_TYPE_INDEX_FUNCTION_SIGNATURE is used by boost::typeindex::ctti_type_index class to
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/// deduce the name of a type. If your compiler is not recognized
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/// by the TypeIndex library and you wish to work with boost::typeindex::ctti_type_index, you may
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/// define this macro by yourself.
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///
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/// BOOST_TYPE_INDEX_FUNCTION_SIGNATURE must be defined to a compiler specific macro
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/// that outputs the \b whole function signature \b including \b template \b parameters.
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///
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/// If your compiler is not recognised and BOOST_TYPE_INDEX_FUNCTION_SIGNATURE is not defined,
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/// then a compile-time error will arise at any attempt to use boost::typeindex::ctti_type_index classes.
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///
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/// See BOOST_TYPE_INDEX_REGISTER_CTTI_PARSING_PARAMS and BOOST_TYPE_INDEX_CTTI_USER_DEFINED_PARSING
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/// for an information of how to tune the implementation to make a nice pretty_name() output.
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#define BOOST_TYPE_INDEX_FUNCTION_SIGNATURE BOOST_CURRENT_FUNCTION
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/// \def BOOST_TYPE_INDEX_CTTI_USER_DEFINED_PARSING
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/// This is a helper macro for making correct pretty_names() with RTTI off.
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///
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/// BOOST_TYPE_INDEX_CTTI_USER_DEFINED_PARSING macro may be defined to
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/// '(begin_skip, end_skip, runtime_skip, runtime_skip_until)' with parameters for adding a
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/// support for compilers, that by default are not recognized by TypeIndex library.
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///
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/// \b Example:
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///
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/// Imagine the situation when
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/// \code boost::typeindex::ctti_type_index::type_id<int>().pretty_name() \endcode
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/// returns the following string:
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/// \code "static const char *boost::detail::ctti<int>::n() [T = int]" \endcode
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/// and \code boost::typeindex::ctti_type_index::type_id<short>().pretty_name() \endcode returns the following:
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/// \code "static const char *boost::detail::ctti<short>::n() [T = short]" \endcode
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///
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/// As we may see first 39 characters are "static const char *boost::detail::ctti<" and they do not depend on
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/// the type T. After first 39 characters we have a human readable type name which is duplicated at the end
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/// of a string. String always ends on ']', which consumes 1 character.
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///
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/// Now if we define `BOOST_TYPE_INDEX_CTTI_USER_DEFINED_PARSING` to
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/// `(39, 1, false, "")` we'll be getting \code "int>::n() [T = int" \endcode
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/// for `boost::typeindex::ctti_type_index::type_id<int>().pretty_name()` and \code "short>::n() [T = short" \endcode
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/// for `boost::typeindex::ctti_type_index::type_id<short>().pretty_name()`.
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///
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/// Now we need to take additional care of the characters that go before the last mention of our type. We'll
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/// do that by telling the macro that we need to cut off everything that goes before the "T = " including the "T = "
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/// itself:
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///
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/// \code (39, 1, true, "T = ") \endcode
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///
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/// In case of GCC or Clang command line we need to add the following line while compiling all the sources:
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///
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/// \code
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/// -DBOOST_TYPE_INDEX_CTTI_USER_DEFINED_PARSING='(39, 1, true, "T = ")'
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/// \endcode
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/// \param begin_skip How many characters must be skipped at the beginning of the type holding string.
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/// Must be a compile time constant.
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/// \param end_skip How many characters must be skipped at the end of the type holding string.
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/// Must be a compile time constant.
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/// \param runtime_skip Do we need additional checks at runtime to cut off the more characters.
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/// Must be `true` or `false`.
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/// \param runtime_skip_until Skip all the characters before the following string (including the string itself).
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/// Must be a compile time array of characters.
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///
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/// See [RTTI emulation limitations](boost_typeindex/rtti_emulation_limitations.html) for more info.
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#define BOOST_TYPE_INDEX_CTTI_USER_DEFINED_PARSING (0, 0, false, "")
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/// Depending on a compiler flags, optimal implementation of type_index will be used
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/// as a default boost::typeindex::type_index.
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///
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/// Could be a boost::typeindex::stl_type_index, boost::typeindex::ctti_type_index or
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/// user defined type_index class.
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///
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/// \b See boost::typeindex::type_index_facade for a full description of type_index functions.
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typedef platform_specific type_index;
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#elif defined(BOOST_TYPE_INDEX_USER_TYPEINDEX)
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// Nothing to do
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#elif (!defined(BOOST_NO_RTTI) && !defined(BOOST_TYPE_INDEX_FORCE_NO_RTTI_COMPATIBILITY)) || defined(BOOST_MSVC)
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typedef boost::typeindex::stl_type_index type_index;
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#else
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typedef boost::typeindex::ctti_type_index type_index;
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#endif
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/// Depending on a compiler flags, optimal implementation of type_info will be used
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/// as a default boost::typeindex::type_info.
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///
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/// Could be a std::type_info, boost::typeindex::detail::ctti_data or
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/// some user defined class.
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///
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/// type_info \b is \b not copyable or default constructible. It is \b not assignable too!
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typedef type_index::type_info_t type_info;
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#if defined(BOOST_TYPE_INDEX_DOXYGEN_INVOKED)
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/// \def BOOST_TYPE_INDEX_USER_TYPEINDEX
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/// BOOST_TYPE_INDEX_USER_TYPEINDEX can be defined to the path to header file
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/// with user provided implementation of type_index.
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///
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/// See [Making a custom type_index](boost_typeindex/making_a_custom_type_index.html) section
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/// of documentation for usage example.
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#define BOOST_TYPE_INDEX_USER_TYPEINDEX <full/absolute/path/to/header/with/type_index.hpp>
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/// \def BOOST_TYPE_INDEX_REGISTER_CLASS
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/// BOOST_TYPE_INDEX_REGISTER_CLASS is used to help to emulate RTTI.
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/// Put this macro into the public section of polymorphic class to allow runtime type detection.
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///
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/// Depending on the typeid() availability this macro will expand to nothing or to virtual helper function
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/// `virtual const type_info& boost_type_info_type_id_runtime_() const noexcept`.
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///
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/// \b Example:
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/// \code
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/// class A {
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/// public:
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/// BOOST_TYPE_INDEX_REGISTER_CLASS
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/// virtual ~A(){}
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/// };
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///
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/// struct B: public A {
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/// BOOST_TYPE_INDEX_REGISTER_CLASS
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/// };
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///
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/// struct C: public B {
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/// BOOST_TYPE_INDEX_REGISTER_CLASS
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/// };
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///
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/// ...
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///
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/// C c1;
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/// A* pc1 = &c1;
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/// assert(boost::typeindex::type_id<C>() == boost::typeindex::type_id_runtime(*pc1));
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/// \endcode
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#define BOOST_TYPE_INDEX_REGISTER_CLASS nothing-or-some-virtual-functions
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/// \def BOOST_TYPE_INDEX_FORCE_NO_RTTI_COMPATIBILITY
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/// BOOST_TYPE_INDEX_FORCE_NO_RTTI_COMPATIBILITY is a helper macro that must be defined if mixing
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/// RTTI on/off modules. See
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/// [Mixing sources with RTTI on and RTTI off](boost_typeindex/mixing_sources_with_rtti_on_and_.html)
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/// section of documentation for more info.
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#define BOOST_TYPE_INDEX_FORCE_NO_RTTI_COMPATIBILITY
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#endif // defined(BOOST_TYPE_INDEX_DOXYGEN_INVOKED)
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/// Function to get boost::typeindex::type_index for a type T.
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/// Removes const, volatile && and & modifiers from T.
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///
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/// \b Example:
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/// \code
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/// type_index ti = type_id<int&>();
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/// std::cout << ti.pretty_name(); // Outputs 'int'
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/// \endcode
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///
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/// \tparam T Type for which type_index must be created.
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/// \throw Nothing.
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/// \return boost::typeindex::type_index with information about the specified type T.
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template <class T>
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inline type_index type_id() BOOST_NOEXCEPT {
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return type_index::type_id<T>();
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}
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/// Function for constructing boost::typeindex::type_index instance for type T.
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/// Does not remove const, volatile, & and && modifiers from T.
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///
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/// If T has no const, volatile, & and && modifiers, then returns exactly
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/// the same result as in case of calling `type_id<T>()`.
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///
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/// \b Example:
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/// \code
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/// type_index ti = type_id_with_cvr<int&>();
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/// std::cout << ti.pretty_name(); // Outputs 'int&'
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/// \endcode
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///
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/// \tparam T Type for which type_index must be created.
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/// \throw Nothing.
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/// \return boost::typeindex::type_index with information about the specified type T.
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template <class T>
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inline type_index type_id_with_cvr() BOOST_NOEXCEPT {
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return type_index::type_id_with_cvr<T>();
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}
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/// Function that works exactly like C++ typeid(rtti_val) call, but returns boost::type_index.
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///
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/// Retunrs runtime information about specified type.
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///
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/// \b Requirements: RTTI available or Base and Derived classes must be marked with BOOST_TYPE_INDEX_REGISTER_CLASS.
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///
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/// \b Example:
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/// \code
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/// struct Base { virtual ~Base(){} };
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/// struct Derived: public Base {};
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/// ...
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/// Derived d;
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/// Base& b = d;
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/// type_index ti = type_id_runtime(b);
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/// std::cout << ti.pretty_name(); // Outputs 'Derived'
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/// \endcode
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///
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/// \param runtime_val Varaible which runtime type must be returned.
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/// \throw Nothing.
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/// \return boost::typeindex::type_index with information about the specified variable.
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template <class T>
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inline type_index type_id_runtime(const T& runtime_val) BOOST_NOEXCEPT {
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return type_index::type_id_runtime(runtime_val);
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}
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}} // namespace boost::typeindex
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#endif // BOOST_TYPE_INDEX_HPP
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