Add entire file mapping overload to factory methods

README.md

@@ -35,6 +35,10 @@ mio::mmap_source mmap(path);
 std::error_code error;
 mio::mmap_source mmap = mio::make_mmap_source(path, offset, size_to_map, error);
 ```
+or:
+```c++
+mio::mmap_source mmap = mio::make_mmap_source(path, error);
+```
 
 - Using the `map` member function:
 ```c++

include/mio/mmap.hpp

@@ -423,7 +423,10 @@ using ummap_source = basic_mmap_source<unsigned char>;
 using mmap_sink = basic_mmap_sink<char>;
 using ummap_sink = basic_mmap_sink<unsigned char>;
 
-/** Convenience factory method that constructs a mapping for any `basic_mmap` type. */
+/**
+ * Convenience factory method that constructs a mapping for any `basic_mmap` or
+ * `basic_mmap` type.
+ */
 template<
     typename MMap,
     typename MappingToken
@@ -449,6 +452,12 @@ mmap_source make_mmap_source(const MappingToken& token, mmap_source::size_type o
     return make_mmap<mmap_source>(token, offset, length, error);
 }
 
+template<typename MappingToken>
+mmap_source make_mmap_source(const MappingToken& token, std::error_code& error)
+{
+    return make_mmap_source(token, 0, map_entire_file, error);
+}
+
 /**
  * Convenience factory method.
  *
@@ -463,6 +472,12 @@ mmap_sink make_mmap_sink(const MappingToken& token, mmap_sink::size_type offset,
     return make_mmap<mmap_sink>(token, offset, length, error);
 }
 
+template<typename MappingToken>
+mmap_sink make_mmap_sink(const MappingToken& token, std::error_code& error)
+{
+    return make_mmap_sink(token, 0, map_entire_file, error);
+}
+
 } // namespace mio
 
 #include "detail/mmap.ipp"

test/test.cpp

@@ -104,6 +104,8 @@ int main()
         // Make sure shared_mmap mapping compiles as all testing was done on
         // normal mmaps.
         mio::shared_mmap_source _3(path, 0, mio::map_entire_file);
+        auto _4 = mio::make_mmap_source(path, error);
+        auto _5 = mio::make_mmap<mio::shared_mmap_source>(path, 0, mio::map_entire_file, error);
     }
 
     std::printf("all tests passed!\n");