Edward Lockhart 23c3edcf21 When determining if a shared_ptr already exists, use a test on the we… (#2819) ... * When determining if a shared_ptr already exists, use a test on the weak_ptr instead of a try/catch block. * When determining if a shared_ptr already exists, use a test on the weak_ptr instead of a try/catch block. * weak_from_this is only available in C++17 and later * Switch to use feature flag instead of C++ version flag. * Add Microsoft-specific check. * Avoid undefined preprocessor macro warning treated as error. * Simplify shared_from_this in init_holder * Include <version> in detail/common.h (~stolen~ borrowed from @bstaletic's #2816) * Move class_::get_shared_from_this to detail::try_get_shared_from_this * Simplify try_get_shared_from_this by using weak_ptr::lock() Co-authored-by: Yannick Jadoul <yannick.jadoul@belgacom.net>		2021-01-30 20:05:13 +01:00
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pybind11	When determining if a shared_ptr already exists, use a test on the we… (#2819)	2021-01-30 20:05:13 +01:00