From 194cd6c5741aeeeeab5590bb5cf9b1ea66c53475 Mon Sep 17 00:00:00 2001
From: Danny Robson <danny@nerdcruft.net>
Date: Tue, 28 Jun 2016 14:15:19 +1000
Subject: [PATCH] io: add view operator to mapped_file

---
 Makefile.am  |  3 +++
 io_posix.hpp |  7 +++++++
 io_posix.ipp | 43 +++++++++++++++++++++++++++++++++++++++++++
 io_win32.hpp | 11 ++++++++++-
 io_win32.ipp | 44 ++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 107 insertions(+), 1 deletion(-)
 create mode 100644 io_posix.ipp
 create mode 100644 io_win32.ipp

diff --git a/Makefile.am b/Makefile.am
index 9a828133..dbcdd166 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -289,6 +289,7 @@ POSIX_FILES = 			\
     debug_posix.cpp		\
     io_posix.cpp		\
     io_posix.hpp		\
+    io_posix.ipp		\
     library_posix.hpp		\
     library_posix.cpp		\
     posix/dir.cpp		\
@@ -309,6 +310,8 @@ if PLATFORM_WIN32
 UTIL_FILES += 			\
     debug_win32.cpp		\
     io_win32.cpp		\
+    io_win32.hpp		\
+    io_win32.ipp		\
     library_win32.hpp		\
     library_win32.cpp		\
     time_win32.cpp		\
diff --git a/io_posix.hpp b/io_posix.hpp
index 7ccc279d..4f3e12ee 100644
--- a/io_posix.hpp
+++ b/io_posix.hpp
@@ -19,6 +19,8 @@
 
 #include "io.hpp"
 
+#include "view.hpp"
+
 #include <sys/mman.h>
 #include <fcntl.h>
 
@@ -48,6 +50,9 @@ namespace util {
             const uint8_t* cbegin (void) const;
             const uint8_t* cend   (void) const;
 
+            template <typename T> operator util::view<const T *restrict> () const &;
+            template <typename T> operator util::view<      T *restrict> ()       &;
+
         private:
             fd m_fd;
             uint8_t *m_data;
@@ -60,4 +65,6 @@ namespace util {
     typedef detail::posix::mapped_file mapped_file;
 }
 
+#include "io_posix.ipp"
+
 #endif
diff --git a/io_posix.ipp b/io_posix.ipp
new file mode 100644
index 00000000..d101f5bf
--- /dev/null
+++ b/io_posix.ipp
@@ -0,0 +1,43 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Copyright 2016 Danny Robson <danny@nerdcruft.net>
+ */
+
+#ifdef   __UTIL_IO_POSIX_IPP
+#error
+#endif
+
+#define __UTIL_IO_POSIX_IPP
+
+
+///////////////////////////////////////////////////////////////////////////////
+template <typename T>
+util::detail::posix::mapped_file::operator util::view<const T *restrict> () const &
+{
+    return {
+        reinterpret_cast<const T*restrict> (cbegin ()),
+        reinterpret_cast<const T*restrict> (cend ())
+    };
+}
+
+
+//-----------------------------------------------------------------------------
+template <typename T>
+util::detail::posix::mapped_file::operator util::view<T *restrict> () &
+{
+    return {
+        reinterpret_cast<T* restrict> (begin ()),
+        reinterpret_cast<T* restrict> (end ())
+    };
+}
diff --git a/io_win32.hpp b/io_win32.hpp
index 907882fe..43f0ce67 100644
--- a/io_win32.hpp
+++ b/io_win32.hpp
@@ -17,7 +17,8 @@
 #ifndef __UTIL_IO_WIN32_HPP
 #define __UTIL_IO_WIN32_HPP
 
-#include "win32/handle.hpp"
+#include "./win32/handle.hpp"
+#include "./view.hpp"
 
 #include <cstdint>
 #include <boost/filesystem/path.hpp>
@@ -59,6 +60,12 @@ namespace util {
             const uint8_t* cbegin (void) const;
             const uint8_t* cend   (void) const;
 
+            template <typename T>
+            operator util::view<const T *restrict> () const &;
+
+            template <typename T>
+            operator util::view<T *restrict> () &;
+
         private:
             ::util::win32::handle m_file;
             ::util::win32::handle m_mapping;
@@ -71,4 +78,6 @@ namespace util {
     typedef detail::win32::mapped_file mapped_file;
 }
 
+#include "io_win32.ipp"
+
 #endif
diff --git a/io_win32.ipp b/io_win32.ipp
new file mode 100644
index 00000000..3e5d9d3a
--- /dev/null
+++ b/io_win32.ipp
@@ -0,0 +1,44 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Copyright 2016 Danny Robson <danny@nerdcruft.net>
+ */
+
+
+#ifdef   __UTIL_IO_WIN32_IPP
+#error
+#endif
+
+#define __UTIL_IO_WIN32_IPP
+
+
+///////////////////////////////////////////////////////////////////////////////
+template <typename T>
+util::detail::win32::mapped_file::operator util::view<const T *restrict> () const &
+{
+    return {
+        reinterpret_cast<const T*restrict> (cbegin ()),
+        reinterpret_cast<const T*restrict> (cend ())
+    };
+}
+
+
+//-----------------------------------------------------------------------------
+template <typename T>
+util::detail::win32::mapped_file::operator util::view<T *restrict> () &
+{
+    return {
+        reinterpret_cast<T* restrict> (begin ()),
+        reinterpret_cast<T* restrict> (end ())
+    };
+}