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+// Copyright (C) 2017 Davis E. King (davis@dlib.net)
+// License: Boost Software License See LICENSE.txt for the full license.
+#ifndef DLIB_METApROGRAMMING_Hh_
+#define DLIB_METApROGRAMMING_Hh_
+
+
+namespace dlib
+{
+
+// ----------------------------------------------------------------------------------------
+
+ template <size_t... n>
+ struct compile_time_integer_list
+ {
+ /*!
+ WHAT THIS OBJECT REPRESENTS
+ The point of this type is to, as the name suggests, hold a compile time list of integers.
+ As an example, here is something simple you could do with it:
+
+ template <size_t... ints>
+ void print_compile_time_ints (
+ compile_time_integer_list<ints...>
+ )
+ {
+ print(ints...);
+ }
+
+ int main()
+ {
+ print_compile_time_ints(compile_time_integer_list<0,4,9>());
+ }
+
+ Which just calls: print(0,4,9);
+
+ This is a simple example, but this kind of thing is useful in larger and
+ more complex template metaprogramming constructs.
+ !*/
+
+ template <size_t m>
+ struct push_back
+ {
+ typedef compile_time_integer_list<n..., m> type;
+ };
+ };
+
+// ----------------------------------------------------------------------------------------
+
+ template <size_t max>
+ struct make_compile_time_integer_range
+ {
+ /*!
+ WHAT THIS OBJECT REPRESENTS
+ This object makes a compile_time_integer_list containing the integers in the range [1,max] inclusive.
+ For example:
+ make_compile_time_integer_range<4>::type
+ evaluates to:
+ compile_time_integer_list<1,2,3,4>
+ !*/
+
+ typedef typename make_compile_time_integer_range<max-1>::type::template push_back<max>::type type;
+ };
+ // base case
+ template <> struct make_compile_time_integer_range<0> { typedef compile_time_integer_list<> type; };
+
+// ----------------------------------------------------------------------------------------
+
+}
+
+#endif // DLIB_METApROGRAMMING_Hh_
+
+