本文始发于水木清华BBS,转载请保留作者信息,谢谢
Auther: chen3feng (RoachCock@smth)
email: [email protected] mailto:[email protected] [email protected]
发信人: RoachCock (chen3feng), 信区: CPlusPlus
标 题: [代码]定长字符串模板类
发信站: BBS 水木清华站 (Sat Oct 26 19:32:50 2002), 站内信件
I.引言
在Basic(俺的入门语言),Pascal等语言中都提供了定长字符串类型,各有特色,Basic的
是长度固定,超出截断,不足补空格;pascal的是最大长度限制在某个范围.
虽然定长字符串有这样那样的缺点(例如长度有限,弄不好会丢失数据;)
定长字符串还是有一定的好处,主要是:
1.不分配在堆上,从而不会造成内存碎片
2.静态分配内存,分配速度快
因此我写了一个定长字符串类,用作轻量级的字符串.类似于pascal的定长字符串,也采用也采取饱和的方式来处理溢出.
II.简介
主要类有:
1.
template<typename T,typename Traits=std::char_traits<T> >
class basic_small_string_base;
这是定长字符串的基类,适用于各种字符类型,当然也支持"火星人的三字节字符".
模板类的代码主要实现在该类中.该类是抽象类,不能够实例化.
2.
template<typename T, size_t MaxSize, typename Traits=std::char_traits<T> >
class basic_small_string; // : public basic_small_string_base<T,Traits>
特定长度的定长字符串模板类.如果C++标准支持模板typedef的话,下面的4的俩类就不用再写了,遗憾的是还不支持,所以他也是抽象类.//其实做成可实例化的类也没任何问题。
3.
typedef basic_small_string_base<char, std::char_traits<char> >
small_string_base;
typedef basic_small_string_base<wchar_t, std::char_traits<wchar_t> >
small_wstring_base;
针对char和wchar_t(我特讨厌这后面的_t这根尾巴)两种字符类型的基类的和默认traits
的typedef.写函数参数类型的时候可以少写几个字, ^=^
4.
template <size_t MaxSize, typename Traits=std::char_traits<char> >
class small_string; // : public basic_small_string<char, MaxSize,Traits>
这是定长字符串的基类,适用于各种字符类型,当然也支持"火星人的三字节字符".
模板类的代码主要实现在该类中.该类是抽象类,不能够实例化.
2.
template<typename T, size_t MaxSize, typename Traits=std::char_traits<T> >
class basic_small_string; // : public basic_small_string_base<T,Traits>
特定长度的定长字符串模板类.如果C++标准支持模板typedef的话,下面的4的俩类就不用
再写了,遗憾的是还不支持,所以他也是抽象类.//其实做成可实例化的类也没任何问题。
3.
typedef basic_small_string_base<char, std::char_traits<char> >
small_string_base;
typedef basic_small_string_base<wchar_t, std::char_traits<wchar_t> >
small_wstring_base;
针对char和wchar_t(我特讨厌这后面的_t这根尾巴)两种字符类型的基类的和默认traits
的typedef.写函数参数类型的时候可以少写几个字, ^=^
4.
template <size_t MaxSize, typename Traits=std::char_traits<char> >
class small_string; // : public basic_small_string<char, MaxSize,Traits>
template <size_t MaxSize, typename Traits=std::char_traits<wchar_t> >
class small_wstring; // : public basic_small_string<char, MaxSize, Traits>
真正能实例化的ANSI和WCHAR版本的定长字符串类.
III.用法
该模板类用法和std::string一样,可以参考它的文档.另外为了兼容std::basic_string<>,
还提供了和std::string搭配的一些额外功能,比如函数的字符串参数都支持
std::basic_string.可以与std::basic_string<>进行比较,转换,连接等.
1.
包含头文件
#include"small_string.hpp"
2.引入cfc命名空间
using namespace; // 可以略去
3.实例化对象
cfc::small_string<16> s="hello"; // 一个缓冲区长度为16的定长字符串,内容为"hello"
// 最大长度为15,而不是16,注意!
作局部变量时效率上基本上等于 char s[]="hello";低于char *s="hello";原因很简单.
可以和std::string协同操作:
std::string s3 = s;
s = s3;
4.作为函数参数
作为非模板函数的参数传递时,参数的类型应该写成cfc::small_string_base&或者
cfc::small_wstring_base& ,根据需要，可以加上const:
void foo(cfc::small_string_base& str)
{
str="hello";
}
int main()
{
cfc::small_string<32> s;
foo(s);
}
其他插入,比较,删除等操作跟std::string一样
IV.实现
利用模板的最大缓冲区长度参数,实例化模板,把缓冲区作为数组直接建立在对象的内部.
为了减少代码膨胀,大部分功能都移入基类.
V.结尾.
由于时间仓促,经历有限,经验不足,缺点错误肯定不少,欢迎大家批评指正.
谢谢!
VI.源程序
源程序已提交给CSDN软件中心，名称为<定长字符串模板类>,类型为源代码，语言为C++.
另外为了方便，把uue格式的贴在下面:
// 用法: 把下面的所有内容存入扩展名为uue的文本文件，然后用winzip或者winrar打开
_=_
_=_ Part 001 of 001 of file small_string.zip
_=_
begin 666 small_string.zip
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