Implement initial version of C++20 module boost.type_index
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@anarthal I'd appreciate comments on this PR on modules (as you proposed at boostorg/core#191 (comment)) BTW, does the MSVC with |
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AFAIR I made it work at some point. Subsequent changes may have broken it again though. |
CMakeLists.txt
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| add_library(boost_type_index) | ||
| target_sources(boost_type_index PUBLIC | ||
| FILE_SET modules_public TYPE CXX_MODULES FILES | ||
| ${CMAKE_CURRENT_LIST_DIR}/modules/type_index.cppm |
modules/type_index.cppm
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| #include <boost/throw_exception.hpp> | ||
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| #ifdef BOOST_TYPE_INDEX_USE_STD_MODULE | ||
| import std; |
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This is technically not allowed. A global module fragment can only contain preprocessor directives, so you should place this in an include. AFAIR clang doesn't complain and MSVC issues a warning. The change I'm suggesting doesn't imply any change in behavior.
| # pragma clang diagnostic ignored "-Winclude-angled-in-module-purview" | ||
| #endif | ||
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| #include <boost/type_index.hpp> |
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If you include your library files in the purview, you need to be extra careful with if-defing out all third party includes. I've seen a <boost/config.hpp> without an ifdef, which would cause any names defined by it (including the ones poured by including STL headers) into the named module.
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| export module boost.type_index; | ||
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| #ifdef __clang__ |
include/boost/type_index.hpp
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| #include <boost/type_index/detail/config.hpp> | ||
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| #include <boost/config.hpp> |
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If you're including this in the purview, you need to ifdef this include out.
| #include <type_traits> | ||
| #endif | ||
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| #include <boost/throw_exception.hpp> |
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You need to ifdef-out other Boost headers, too.
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| #if !defined(BOOST_USE_MODULES) || defined(BOOST_TYPE_INDEX_INTERFACE_UNIT) | ||
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| #include <boost/config.hpp> |
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You need to ifdef-out other Boost headers, too.
| #if !defined(BOOST_USE_MODULES) || defined(BOOST_TYPE_INDEX_INTERFACE_UNIT) | ||
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| #include <boost/type_index/runtime_cast/detail/runtime_cast_impl.hpp> | ||
| #include <boost/throw_exception.hpp> |
| module; | ||
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| #include <version> | ||
| #include <cstddef> |
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Does this work under MSVC? Last time I checked, mixing #include <cstddef> and import std failed. If you encounter this problem, #include <stddef.h> doesn't cause this problem.
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I fail to workaround too many issues on MSVC, so I'd say that "boost.any module does not support MSVC for now".
| add_library(boost_type_index INTERFACE) | ||
| set(__scope INTERFACE) | ||
| endif() | ||
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Am I missing something or is there no ${CMAKE_CURRENT_SOURCE_DIR}/test/CMakeLists.txt? I'd advise to remove this check if you know for sure that the file should be present. AFAIK this is generated by Peter's CMake generator so it's compatible with libraries that don't run their tests via CMake.
2 participants
#include <boost/type_index...is now implicitly doesimport boost.type_indexif the modules are supportedAll the library internals now have unconditional module level linkage.
Significant differences from https://anarthal.github.io/cppblog/modules3:
BOOST_TYPE_INDEX_USE_STD_MODULEmacro switch forimport std;/includeswhile building module. This allows to use module in C++20 and even without usablestdmodule.