■

一時的な文字バッファにstd::stringクラスは使わない、ただそれだけで速くなった。

#pragma once
namespace V4 {
class SplitString

{

	public :

		SplitString(){}
		~SplitString(){ clear();  }
		USHORT Split( LPCWSTR str, WCHAR ch )

		{

			USHORT s = 0, e=0;

			std::vector> ar;
			int total_len = 0;
			for( int i =0; i < lstrlen(str); i++ )

			{

				if ( str[i] == ch )

				{

					std::pair s1( s,e );

					ar.push_back(s1);
					total_len += (e-s+1);

					s = e + 1;

				}		

				e++;

			}
			if ( s!=e )

			{

				std::pair s1( s,e );

				ar.push_back(s1);

				total_len += (e-s+1);

			}
			WCHAR* wx = new WCHAR[ total_len ];

			LPWSTR sb = wx;
			for(auto& it : ar )

			{

				int len = it.second-it.first;

						

				memcpy(sb, str+it.first, sizeof(WCHAR)*len);
				sb[len] = 0;

				sb += len+1;

			}
			

			cxt_.buf = (LPWSTR*)wx;

			cxt_.total_len = total_len;

			cxt_.cnt = (USHORT)ar.size();

			cxt_.idx = new USHORT[cxt_.cnt];

			int j = 0;

			for(auto& it : ar )

				cxt_.idx[j++] = it.first;
			return cxt_.cnt;

	

		}
		LPCWSTR operator[] (USHORT idx )

		{	

			if ( idx >= cxt_.cnt )

				return NULL;
			LPWSTR p = (LPWSTR) cxt_.buf;

			return (LPCWSTR)&p[cxt_.idx[idx]];

		}

		

		USHORT size() const {cxt_.cnt; }
		void clear(){ cxt_.Clear(); }
	private :

		struct Context

		{

			Context()

			{

				idx = nullptr;

				buf = nullptr;

				total_len = 0;

				cnt = 0;

			}
			void Clear()

			{

				delete [](WCHAR*)buf;

				delete [] idx;

				buf = nullptr;

				idx = nullptr;

				total_len = 0;

				cnt = 0;

			}
			LPWSTR* buf;

			USHORT* idx;

			USHORT total_len;

			USHORT cnt;

		};
		Context cxt_;

 };
};