AI代码解释 //设置命名空间,防止与库中的string类冲突namespace mfc{classstring{public://成员函数private://成员变量char*_str;size_t _size;size_t _capacity;staticsize_t npos;};size_t string::npos=-1;//静态成员变量只在类外初始化一次}; 🎏实现string类默认成员函数 一般的类默认成员函数有6个,...
void Teststring7() { // 获取file的后缀 string file("string.cpp"); size_t pos = file.rfind('.');//从后往前找字符. string suffix(file.substr(pos, file.size() - pos));//拷贝pos位置之后的字符串 cout << suffix << endl; // 取出url中的域名 string url("http://www.cplusplus.com...
SSO 下,string 的数据结构会稍微复杂点,使用 union 来区分短字符串和长字符串的场景: classstring{char*start;size_tsize;staticconstintkLocalSize =15;union{charbuffer[kLocalSize+1];// 满足条件时,用来存放短字符串size_tcapacity; }data; }; 短字符串,SSO: 长字符串,eager copy: 这种数据结构的实现下,...
// string_swap.cpp// compile with: /EHsc#include<string>#include<iostream>intmain( ){usingnamespacestd;// Declaring an object of type basic_string<char>strings1("Tweedledee");strings2("Tweedledum");cout<<"Before swapping string s1 and s2:"<<endl;cout<<"The basic_string s1 = "<< s1...
比如 folly/io/IOBuf.cpp 中的调用：// Ensure NUL terminated *writableTail() = 0; fbstring str(...
// basic_string_capacity.cpp // compile with: /EHsc #include <string> #include <iostream> int main( ) { using namespace std; string str1 ("Hello world"); cout << "The original string str1 is: " << str1 << endl; // The size and length member functions differ in name only ba...
In a fast pass operation, reference counting is suspended. String::Length Retrieves the length of the current String object. String::ToString Returns a String object whose value is the same as the current string.OperatorsThe String class has the following operators....
说明:以下涉及的std::string的源代码摘自4.8.2版本。 结论:std::string的拷贝复制是基于引用计数的浅拷贝,因此它们指向相同的数据地址。 // std::string类定义 typedef basic_string string; template class basic_string { private: // _Alloc_hider是模板类basic_string内嵌struct struct _Alloc_hider : _Alloc...
class _Traits = char_traits<_CharT>, class _Allocator = allocator<_CharT> > class _LIBCPP_TEMPLATE_VIS basic_string; typedef basic_string<char, char_traits<char>, allocator<char> > string; 2、内存结构 libc++ string 的内存结构更巧妙一些,针对使用过程中更多的字符串都是短字符串,且字符串经常...
// basic_string_const_ptr.cpp // compile with: /EHsc #include <string> #include <iostream> int main( ) { using namespace std; basic_string<char>::const_pointer pstr1a = "In Here"; const char *cstr1c = "Out There"; cout << "The string pstr1a is: " << pstr1a << "." <...