__next_prime symbol undefined

Question

I am including unordered_map in a XCode project for iOS. Originally when I tried linking I got errors for new and delete operations, but when I added \"-lstdc++\" to \"Other

Answer 1

This function is a private method in LLVM's libc++: http://www.opensource.apple.com/source/libcpp/libcpp-31/src/hash.cpp?txt. Therefore, you need to change your C++ Standard Library to libc++ (LLVM C++ standard library with C++11 support), or change your linker flag to -lc++.