Boost C++ Libraries

	Caution
	C++20 module support is on early stage, targets, flags and behavior may change in the future

If using modern CMake define CMake option -DBOOST_USE_MODULES=1 to build a C++20 module and make the Boost::any CMake target provide it. After that an explicit usage of C++20 module boost.any is allowed:

import boost.any;

int main() {
    boost::any a = 42;
}

The Boost::any CMake target gives an ability to mix includes and imports of the library in different translation units. Moreover, if BOOST_USE_MODULES macro is defined then all the boost/any... includes implicilty do import boost.any; to give all the benifits of modules without changing the existing code.

	Note
	For better compile times make sure that import std; is available when building the boost.any module (in CMake logs there should be a 'Using import std;' message).

If not using CMake, then the module could be build manually from the modules/boost_any.cppm file.

For manual module build the following commands could be used for clang compiler:

cd any/modules
clang++ -I ../include -std=c++20 --precompile -x c++-module boost_any.cppm

After that, the module could be used in the following way:

clang++ -std=c++20 -fmodule-file=boost_any.pcm boost_any.pcm usage_sample.cpp