added boost_math_std_using to trunc overload [windows]

Author: mzhelyez

.gitignore

@@ -13,7 +13,9 @@ build/*
 #*.svg
 tools/bin/**
 .idea/*
-
+# autogenerated for table in reverse mode docs
+doc/differentiation/compilation_table.txt
+test/test_reverse_mode_autodiff_special_functions_compile/generated_jam_compile_commands.txt
 # CMake Related Options
 *.a
 *.o

include/boost/math/differentiation/detail/reverse_mode_autodiff_stl_expressions.hpp

@@ -810,6 +810,7 @@ struct fmod_left_float_expr
     }
     static const inner_t derivative(const inner_t &argv, const inner_t & /*v*/, const RealType &constant)
     {
+        BOOST_MATH_STD_USING
         return static_cast<RealType>(-1.0) * trunc(constant / argv);
     }
 };