use macro protect all throw function

[okhowang]

fix #60
I use macro protect throw currently.
additionly, remove_all and recursive_directory_iterator::increment has a little change for ec processing

[gulrak]

I think i would prefer early in the header something along the lines of:

#if !defined(GHC_WITH_EXCEPTIONS) && (defined(__EXCEPTIONS) || defined(__cpp_exceptions) || defined(_CPPUNWIND))
#define GHC_WITH_EXCEPTIONS
#endif

Then all other #if would become #ifdef GHC_WITH_EXCEPTIONS and someone with a compiler not using one of the macros to signal exception support can enable it with the define without setting macros in compiler private namespace.

And it is easier to expand if needed.

[okhowang]

I think i would prefer early in the header something along the lines of:

#if !defined(GHC_WITH_EXCEPTIONS) && (defined(__EXCEPTIONS) || defined(__cpp_exceptions) || defined(_CPPUNWIND))
#define GHC_WITH_EXCEPTIONS
#endif

Then all other #if would become #ifdef GHC_WITH_EXCEPTIONS and someone with a compiler not using one of the macros to signal exception support can enable it with the define without setting macros in compiler private namespace.

And it is easier to expand if needed.

done

[gulrak]

Thanks for the work and for the corrections.