添加std::string的format函数

From: http://blog.csdn.net/tingsking18/article/details/6699274

 

//============================================================================
// Name        : main.cpp
// Author      : Jing
// Version     :
// Copyright   : Jing
// Description : Hello World in C++, Ansi-style
//============================================================================

#include 
#include 
#include 
#include 

using namespace std;

template
class SString: public basic_string<_CharT, _Traits, _Alloc>
{
public:
	typedef typename _Alloc::template rebind<_CharT>::other _CharT_alloc_type;

	typedef typename _CharT_alloc_type::size_type size_type;

	static const size_type npos = static_cast (-1);


	inline SString() :
		basic_string<_CharT, _Traits, _Alloc> ()
	{
	}
	explicit SString(const _Alloc& __a) :
		basic_string<_CharT, _Traits, _Alloc> ()
	{
	}

	SString(const SString& __str) :
		basic_string<_CharT, _Traits, _Alloc> (__str)
	{
	}

	SString(const SString& __str, size_type __pos, size_type __n = npos) :
		basic_string<_CharT, _Traits, _Alloc> (__str, __pos, npos)
	{
	}

	SString(const SString& __str, size_type __pos, size_type __n,
			const _Alloc& __a) :
		basic_string<_CharT, _Traits, _Alloc> (__str, __pos, __n, __a)
	{
	}

	SString(const _CharT* __s, size_type __n, const _Alloc& __a = _Alloc()) :
		basic_string<_CharT, _Traits, _Alloc> (__s, __n, __a)
	{
	}

	SString(const _CharT* __s, const _Alloc& __a = _Alloc()) :
		basic_string<_CharT, _Traits, _Alloc> (__s, __a)
	{
	}

	SString(size_type __n, _CharT __c, const _Alloc& __a = _Alloc()) :
		basic_string<_CharT, _Traits, _Alloc> (__n, __c, __a)
	{
	}

	template
	SString(_InputIterator __beg, _InputIterator __end, const _Alloc& __a =
			_Alloc()) :
		basic_string<_CharT, _Traits, _Alloc> (__beg, __end, __a)
	{
	}

	SString& operator=(const SString& __str)
	{
		return this->assign(__str);
	}

	SString& operator=(const _CharT* __s)
	{
		return this->assign(__s);
	}

	SString& operator=(_CharT __c)
	{
		this->assign(1, __c);
		return *this;
	}

	inline SString &Format(const char *_format, ...)
	{
		char szBuffer[1000];
		memset(szBuffer, 0x00, sizeof(szBuffer));

		va_list ap;
		va_start(ap, _format);

		try
		{
			vsnprintf(szBuffer, 1000, _format, ap);
		} catch (...)
		{
			cout << "ERROR: format the string failed..." << endl;
			return *this;
		}

		va_end(ap);
		this->append(szBuffer);
		return *this;
	}

};
typedef SString , allocator > CString;

int main(int argc, char* argv[])
{

	CString s("a");
	CString s1 = s.Format("abc%d", 1);
	CString s4 = s;
	CString s2(s1);
	CString s3(s1.begin(), s1.end());
	cout << s3.c_str() << endl;
	int i;
	cin >> i;
	return 0;

}