Added string classes

include/internal/catch_string.h

@@ -0,0 +1,48 @@
+/*
+ *  Copyright 2016 Two Blue Cubes Ltd. All rights reserved.
+ *
+ *  Distributed under the Boost Software License, Version 1.0. (See accompanying
+ *  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+ */
+#ifndef CATCH_STRING_H_INCLUDED
+#define CATCH_STRING_H_INCLUDED
+
+namespace Catch {
+    
+    class StringData;
+    class StringRef;
+    class StringBuilder;
+
+    /// An owning, ref-counted, immutable string type.
+    /// The ref count (not visible here as it is defined in StringData) is atomic
+    /// so instances should be safe to share across threads
+    class String {
+        friend class StringRef;
+        friend class StringBuilder;
+
+        StringData const* m_data = nullptr;
+    public:
+        using size_type = unsigned long;
+        
+        String();
+        String( StringRef const& stringRef );
+        String( char const* rawString );
+        String( String const& other );
+        String( String&& other );
+        String( StringBuilder&& stringBuf );
+        
+        ~String() noexcept;
+        
+        auto operator = ( String const& other ) -> String&;
+        
+        auto operator == ( StringRef const& other ) const noexcept -> bool;
+        auto operator == ( char const* other ) const noexcept -> bool;
+        
+        auto empty() const noexcept -> bool;
+        auto size() const noexcept -> size_type;
+        auto c_str() const noexcept -> char const*;
+    };
+    
+} // namespace Catch
+
+#endif // CATCH_STRING_H_INCLUDED