fix msvc 10 error.

vprus · vprus · commit d95d31684832 · 2018-07-06T17:35:12.000+03:00
diff --git a/src/options_description.cpp b/src/options_description.cpp
@@ -181,8 +181,9 @@ namespace boost { namespace program_options {
     const std::pair<const std::string*, std::size_t>
     option_description::long_names() const
     {
+        // reinterpret_cast is to please msvc 10.
         return (m_long_names.empty())
-            ? std::pair<const std::string*, size_t>( NULL, 0 )
+            ? std::pair<const std::string*, size_t>(reinterpret_cast<const std::string*>(0), 0 )
             : std::pair<const std::string*, size_t>( &(*m_long_names.begin()), m_long_names.size());
     }
 

Original file line number	Diff line number	Diff line change
`@@ -181,8 +181,9 @@ namespace boost { namespace program_options {`
`181`	`181`	`const std::pair<const std::string*, std::size_t>`
`182`	`182`	`option_description::long_names() const`
`183`	`183`	`{`
	`184`	`+ // reinterpret_cast is to please msvc 10.`
`184`	`185`	`return (m_long_names.empty())`
`185`		`- ? std::pair<const std::string*, size_t>( NULL, 0 )`
	`186`	`+ ? std::pair<const std::string, size_t>(reinterpret_cast<const std::string>(0), 0 )`
`186`	`187`	`: std::pair<const std::string, size_t>( &(m_long_names.begin()), m_long_names.size());`
`187`	`188`	`}`
`188`	`189`