preparing compile time url parsing

.gitignore

@@ -19,3 +19,6 @@
 *.exe
 *.out
 *.app
+
+example
+unittest

Makefile

@@ -1,4 +1,4 @@
-all: example
+all: example unittest
 example: example.cpp flask.h http_server.h http_connection.h parser.h http_response.h
 	g++ -g -std=c++11 -o example example.cpp http-parser/http_parser.c -pthread -lboost_system -lboost_thread -I http-parser/
 test: example
@@ -6,3 +6,6 @@ test: example
 	./example &
 	python test.py || exit 0
 	pkill example
+unittest: unittest.cpp routing.h
+	g++ -g -std=c++11 -o unittest unittest.cpp
+

flask.h

@@ -32,7 +32,7 @@ namespace flask
         template <typename F>
         void route(const std::string& url, F f)
         {
-            auto yameHandler = [f]{
+            auto yameHandler = [f = std::move(f)]{
                 return response(f());
             };
             yameHandlers_.emplace(url, yameHandler);

routing.h

@@ -0,0 +1,39 @@
+#pragma once
+
+#include <cstdint>
+
+#include "utility.h"
+
+namespace flask
+{
+    namespace black_magic
+    {
+        constexpr bool is_equ_n(StrWrap a, int ai, StrWrap b, int bi, int n)
+        {
+            return n == 0 ? true : a[ai] != b[bi] ? false : is_equ_n(a,ai+1,b,bi+1,n-1);
+        }
+
+        constexpr bool is_int(StrWrap s, int i)
+        {
+            return is_equ_n(s, i, "<int>", 0, 5);
+        }
+
+        constexpr bool is_str(StrWrap s, int i)
+        {
+            return is_equ_n(s, i, "<str>", 0, 5);
+        }
+
+        //constexpr ? parse_route(StrWrap s)
+        //{
+            //return 
+        //}
+    }
+
+    class Router
+    {
+    public:
+        constexpr Router(black_magic::StrWrap s)
+        {
+        }
+    };
+}

unittest.cpp

@@ -0,0 +1,27 @@
+#include "routing.h"
+#include <functional>
+#include "utility.h"
+
+using namespace flask;
+using namespace flask::black_magic;
+
+template <int N> struct T{};
+
+int main()
+{
+    try
+    {
+        throw T<is_int("1<int>22",0)>(); 
+    }
+    catch(T<0>)
+    {
+    }
+
+    try
+    {
+        throw T<is_int("1<int>22",1)>(); 
+    }
+    catch(T<1>)
+    {
+    }
+}

utility.h

@@ -0,0 +1,52 @@
+#pragma once
+
+namespace flask
+{
+	namespace black_magic
+	{
+		struct OutOfRange
+		{
+			OutOfRange(unsigned pos, unsigned length) {}
+		};
+		constexpr unsigned requires_in_range( unsigned i, unsigned len )
+		{
+			return i >= len ? throw OutOfRange(i, len) : i;
+		}
+
+		// from http://akrzemi1.wordpress.com/2011/05/11/parsing-strings-at-compile-time-part-i/
+		class StrWrap
+		{
+			const char * const begin_;
+			unsigned size_;
+
+			public:
+			template< unsigned N >
+				constexpr StrWrap( const char(&arr)[N] ) : begin_(arr), size_(N - 1) {
+					static_assert( N >= 1, "not a string literal");
+				}
+
+			constexpr char operator[]( unsigned i ) { 
+				return requires_in_range(i, size_), begin_[i]; 
+			}
+
+			constexpr operator const char *() { 
+				return begin_; 
+			}
+
+			constexpr unsigned size() { 
+				return size_; 
+			}
+		};
+
+
+		constexpr int find_closing_tag(StrWrap s, std::size_t p)
+		{
+			return s[p] == '>' ? p : find_closing_tag(s, p+1);
+		}
+
+		constexpr int count(StrWrap s, int i=0)
+		{
+			return i == s.size() ? 0 : s[i] == '<' ? 1+count(s,i+1) : count(s,i+1);
+		}
+	}
+}