On Sat, Nov 5, 2016 at 1:00 PM, Robert Ramey <ramey@rrsd.com> wrote:
On 11/5/16 12:44 PM, Зайцев Александр wrote:
For Boost.Algorithm we can remove all std::unary_function and std::binary_function. I think, we can rewrite sources without these functions.
I'm guessing that could be done for all the libraries. But would that permit the usage of the libraries by those who depend upon C++03 compilers?
I don't think there's anything in boost (or the standard library) that depends specifically on std::unary_function. (except TR1) Here's the definition: template <class _Arg, class _Result> struct unary_function { typedef _Arg argument_type; typedef _Result result_type; }; template <class _Arg1, class _Arg2, class _Result> struct binary_function { typedef _Arg1 first_argument_type; typedef _Arg2 second_argument_type; typedef _Result result_type; }; However, I am pretty sure that there are parts of boost and/or the standard library that depend on the presence of (say) result_type: For example, I found this in libs/accumulators/include/boost/accumulators/statistics/kurtosis.hpp: typedef typename numeric::functional::fdiv<Sample, Sample>::result_type result_type; The #2 option I suggested would look like this. change: template<typename T> struct plus: binary_function<T, T, T> { T operator() (const T& x, const T& y) { return x + y } }; to: template<typename T> struct plus { typedef T first_argument_type; typedef T second_argument_type; typedef T result_type; T operator() (const T& x, const T& y) { return x + y } }; -- Marshall