Adds std::is_constant_evaluated().
Other papers in constexpr expansion (C++20)
P1064R0Allowing virtual function calls in constant expressionsRapperswil 2018P1002R1
try-catch blocks in constexpr functionsSan Diego 2018P1073R3Immediate functionsSan Diego 2018P1327R1Allowing dynamic_cast, polymorphic typeid in constant expressionsSan Diego 2018P1330R0Changing the active member of a union inside constexprSan Diego 2018P0784R7More constexpr containersCologne 2019All 12 papers in constexpr expansion (C++20) →