Fix parsing char type

Fixes #201. Parse char type correctly and check for length.

CHANGELOG.md

@@ -11,6 +11,7 @@ options. The project adheres to semantic versioning.
 * Allow for exceptions to be disabled.
 * Fix duplicate default options when there is a short and long option.
 * Add `CXXOPTS_NO_EXCEPTIONS` to disable exceptions.
+* Fix char parsing for space and check for length.
 
 ## 2.2
 

README.md

@@ -150,7 +150,7 @@ GCC >= 4.9 or clang >= 3.1 with libc++ are known to work.
 
 The following compilers are known not to work:
 
-* MSVC 13
+* MSVC 2013
 
 # TODO list
 

include/cxxopts.hpp

@@ -763,6 +763,17 @@ namespace cxxopts
     }
 #endif
 
+    inline
+    void parse_value(const std::string& text, char& c)
+    {
+      if (text.length() != 1)
+      {
+        throw_or_mimic<argument_incorrect_type>(text);
+      }
+
+      c = text[0];
+    }
+
     template <typename T>
     struct type_is_container
     {

src/example.cpp

@@ -43,6 +43,7 @@ parse(int argc, char* argv[])
       .add_options()
       ("a,apple", "an apple", cxxopts::value<bool>(apple))
       ("b,bob", "Bob")
+      ("char", "A character", cxxopts::value<char>())
       ("t,true", "True", cxxopts::value<bool>()->default_value("true"))
       ("f, file", "File", cxxopts::value<std::vector<std::string>>(), "FILE")
       ("i,input", "Input", cxxopts::value<std::string>())
@@ -89,6 +90,11 @@ parse(int argc, char* argv[])
       std::cout << "Saw option ‘b’" << std::endl;
     }
 
+    if (result.count("char"))
+    {
+      std::cout << "Saw a character ‘" << result["char"].as<char>() << "’" << std::endl;
+    }
+
     if (result.count("f"))
     {
       auto& ff = result["f"].as<std::vector<std::string>>();