When compiling on CentOS with clang 3.7.1, using the modern c++ library, i.e., using CXXFLAGS="std=c+11 -stdlib=libc+", use of options.max_time()>count() in collection.cpp and seconds.count() in modify_collection.cpp are found to be ambiguous by the compiler.

In the first case of the 4 uses of options.max_time()->count() in collection.cpp, count() is a signed integral of at least 45 bits. In the case of the single seconds.count() in modify_collection.cpp, count() is a signed integral of at least 35 bits.

Thus, it would seem that wrapping these in bsoncxx:types:b_int64 is the right thing to do, and it does in our case prevent the compiler from erroring out on the ambiguity, but we're just trying the non-legacy library for the first time, and thus aren't sure if this is an ideal approach.