P-Stade Oven range library provides many useful range adaptors. For your use case, you can use more generic `pstade::oven::elements_c<N>` range range adaptor (or `pstade::oven::make_elements_c<N>`) *boost::find_if(rng | pstade::oven::elements_c<0>(), pred) = val; *boost::find_if(pstade::oven::make_elements_c<0>(rng), pred) = val; Here is the documentation: http://p-stade.sourceforge.net/oven/doc/html/oven/range_adaptors.html#oven.r... See also: http://p-stade.sourceforge.net/oven/doc/html/oven/range_adaptors.html#oven.r... If you use clang and libc++, you might have a compile error due to the incompatibility between the forward declaration and the inline namespace. In that case, you can fix the problem by removing the forward declaration of `std::pair` and adding `#include <utility>` in pstade/apple/pair_fwd.hpp. Regards, Michel