nonnull warning with GCC 11

[JulZimmermann]

Hi,

when compiled with -Wall GCC 11 will bring up a nonnul warning.

It's probably a false positive, but maybe there is a way to silence this warning inside the library?

Thanks!

Expected Behavior

No warnings

Actual Behavior

in file included from ../diTest.cpp:3:
../boost-di/include/boost/di.hpp: In instantiation of ‘auto boost::ext::di::v1_2_0::make_injector(TDeps ...) [with TConfig = boost::ext::di::v1_2_0::config; TDeps = {}; typename boost::ext::di::v1_2_0::aux::concept_check<typename boost::ext::di::v1_2_0::concepts::boundable__<boost::ext::di::v1_2_0::aux::type_list<T2s ...> >::type>::type <anonymous> = 0; typename boost::ext::di::v1_2_0::aux::concept_check<typename boost::ext::di::v1_2_0::concepts::configurable__<T>::type>::type <anonymous> = 0]’:
../diTest.cpp:14:45:   required from here
../boost-di/include/boost/di.hpp:3048:63: warning: ‘this’ pointer is null [-Wnonnull]
 3048 |       core::injector<TConfig, decltype(((TConfig*)0)->policies((concepts::injector<TConfig>*)0)), TDeps...>{
      |                                        ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../boost-di/include/boost/di.hpp:3041:61: note: in definition of macro ‘__BOOST_DI_MAKE_INJECTOR’
 3041 | #define __BOOST_DI_MAKE_INJECTOR(...) detail::make_injector(__VA_ARGS__)
      |                                                             ^~~~~~~~~~~
../boost-di/include/boost/di.hpp:1965:8: note: in a call to non-static member function ‘auto boost::ext::di::v1_2_0::config::policies(T*) [with T = boost::ext::di::v1_2_0::concepts::injector<boost::ext::di::v1_2_0::config>]’
 1965 |   auto policies(T*) noexcept {
      |        ^~~~~~~~

Mimimal Example:

#include <iostream>

#include "boost/di.hpp"

class Bar {
public:
    int getI() const { return i; }

private:
    int i = 2;
};

int main() {
    auto injector = boost::di::make_injector();

    auto bar = injector.create<std::shared_ptr<Bar>>();

    std::cout << std::to_string(bar->getI()) << std::endl;
}

Specifications

• Version: Current master
• Platform: Linux. GCC: g++ (SUSE Linux) 11.1.1 20210617 [revision 79c1185de4a05fdea13b6b020795892913f8184e]

[JulZimmermann]

Thanks for fixing this!