Fix docopt#2: gcc-4.9 didnt like one of the decltype constructs

jaredgrubb · jaredgrubb · commit e5df42539208 · 2014-08-27T09:53:42.000-07:00
diff --git a/README.rst b/README.rst
@@ -71,12 +71,15 @@ and we have tried to maintain full feature parity (and code structure) as the
 original.
 
 This port is written in C++11 and also requires a good C++11 standard library
-(in particular, one with ``regex`` support). The following compilers should
-be able to handle this:
+(in particular, one with ``regex`` support). The following compilers are known
+to work with docopt:
 
-- clang 3.3
-- gcc 4.9 (If someone can verify this, or provide patches, that would be great!)
-- Visual C++ 2013: will *not* compile this code. Hopefully next year.
+- clang 3.3 and later
+- gcc 4.9
+
+Note that gcc-4.8 will not work due to its missing the ``regex`` module. 
+Note that Visual C++ 2013 will not compile this code, as its C++11 is not
+quite good enough. If a later VC++ works, please let me know!
 
 This port is licensed under the MIT license, just like the original module.
 However, we are also dual-licensing this code under the Boost License, version 1.0,
diff --git a/docopt.cpp b/docopt.cpp
@@ -589,7 +589,7 @@ std::vector<std::string> longOptions(I iter, I end) {
 	std::vector<std::string> ret;
 	std::transform(iter, end,
 		       std::back_inserter(ret),
-		       [](decltype(*iter) const& opt) { return opt->longOption(); });
+		       [](typename I::reference opt) { return opt->longOption(); });
 	return ret;
 }
 

Original file line number	Diff line number	Diff line change
`@@ -589,7 +589,7 @@ std::vector<std::string> longOptions(I iter, I end) {`
`589`	`589`	`std::vector<std::string> ret;`
`590`	`590`	`std::transform(iter, end,`
`591`	`591`	`std::back_inserter(ret),`
`592`		`- [](decltype(*iter) const& opt) { return opt->longOption(); });`
	`592`	`+ [](typename I::reference opt) { return opt->longOption(); });`
`593`	`593`	`return ret;`
`594`	`594`	`}`
`595`	`595`