cstring.h

关联分类算法采用贪心算法发现高质量分类规则

#ifndef __CSTRING_H__INCLUDED__
#define __CSTRING_H__INCLUDED__

#include <string>
#include <stdarg.h>

class CString {
private:
	std::string m_string;

public:
	CString() {}
	CString(const char* b): m_string(b) {}
	CString(const std::string b): m_string(b) {}

	int GetLength() { return m_string.size(); }

	char GetAt(int p) { return m_string[p]; }

	CString Left(int s) { return CString(m_string.substr(0, s)); }

	void Format(const char* format, ...) {
		char temp[4000];
		va_list vlist;
		va_start( vlist, format );

		vsprintf(temp, format, vlist);
		m_string = temp;

		va_end( vlist );
	}

	operator const char*() {
		return m_string.c_str();
	}

	CString& operator+=(const char* a) {
		m_string += a;
		return *this;
	}
	CString& operator+=(const CString& b) {
		m_string += b.m_string;
		return *this;
	}

	CString& operator=(const char* b) {
		m_string = b;
		return *this;
	}
};

inline CString operator+(const char* a, const CString& b) {
	CString r;
	r += a;
	r += b;
	return r;
}

#endif