const std::string

[JamesBoer]

There are several places in code you're using const std::string to define whitespace and end-of-line strings. There are a couple of issues with this.

First, these aren't inline, meaning that an instance is created for every translation unit.

Second, because you're using std::string, this performs an unnecessary allocation in debug mode (it disappears in release due to SSO). This is causing me problems with my leak detection, since the deallocation order isn't guaranteed, and is occurring after my leak check exit point.

It would be best to simply replace these several instances with inline const char* This will avoid any allocations, and works exactly like before.

inline const char* whitespaceDelimiters = " \t\n\r\f\v";
...
#ifdef _WIN32
    inline const char* endl = "\r\n";
#else
    inline const char* endl = "\n";
#endif

[metayeti]

Thanks for bringing this to my attention, I changed it to const char* const in the latest release. My compiler had issues with inline - I think it should be constexpr for inline. Either way this should optimize allocations.