c++ 去掉字符 ‘\r‘、‘\n‘、‘\t‘、‘ ‘

#include <iostream>
#include <string>
#include <algorithm>
using namespace std;

int main()
{
	std::string ret = "\rfdsaggh\tfdsagah\nfadsssssssssssssssssafsadf\t\rfsadgghfsdfs\n";
	auto String_func = [&](string& s) -> string
	{
		if (s.empty())
			return s;

		std::string _strRet;
		char a = '\r', b = '\t', c = '\n', d = ' ';
		std::for_each(s.begin(), s.end(),
			[&](char& p_chA)
			{		
				if (p_chA == a || p_chA == b || p_chA == c || p_chA == d)
					return;
				_strRet += p_chA;
			});
		return _strRet;
	};

	std::string _Out = String_func(ret);
	cout << "string ouput:" << _Out << endl;         //fdsagghfdsagahfadsssssssssssssssssafsadffsadgghfsdfs
	return 0;
}