std::cout << “The size of str is " << str.length() << " bytes.\n”; return 0; } //Output: //The size of str is 11 bytes 1 2 3 4 5 6 7 8 9 10 11 12 比较一下size与length,其实二者没有任何区别,length是因为沿用C语言的习惯而保留下来的,str
length 和size函数功能相同 max_size 字符串可能的最大大小 capacity 在不重新分配内存的情况下,字符串可能的大小 empty 判断是否为空 operator[] 取第几个元素,相当于数组 c_str 取得C风格的const char* 字符串 data 取得字符串内容地址 operator= 赋值操作符 reserve 预留空间 swap 交换函数 insert 插入字符 ap...
str.length()+1 <= sizeof(std::string); //--这个是判断是不是在堆上分配数据了(还是直接inplace的) std::cout << "is_data-inline:" << is_inline << '\n'; size_t head_len_if_data_inline = (uint64_t)(ptr) -(uint64_t)(&str); if(is_inline) { printf("<"); for(size_t...
int n = value.length; //长度是否相同 if (n == anotherString.value.length) { c...
有两种写法,s.length() 和 s.size() 等价。 其中size 是和 vector 一样的名字,方便程序员理解。 eg:course/15/06/a2.cpp #include <string> #include <string_view> #include <iostream> using namespace std; int main() { string s = "hello"; cout << s.size() << endl; cout << s.lengt...
union _Bxty { // storage for small buffer or pointer to larger one char _Buf[16]; char* _Ptr; char _Alias[16]; // TRANSITION, ABI: _Alias is preserved for binary compatibility (especially /clr) } _Bx; std::size_t _Mysize = 0; // current length of string ...
Note that this class handles bytes independently of the encoding used: If used to handle sequences of multi-byte or variable-length characters (such as UTF-8),all members of this class (such as length or size), as well as its iterators,will still operate in terms of bytes (not actual ...
std::size_t _Mysize = 0; // current length of string std::size_t _Myres = 0; // current storage reserved for string 当std::string中记录的是短字符串时，_Buf代表栈上的字符串，如"Hello World"是存储在_Buf数组中 当std::string中记录的是长字符串时，_Ptr代表指向堆上数据的指针，可通过...
data types in our applications. While using different type of variables we may need to convert th...
// to permit aliasing } _Bx; size_type _Mysize;// current length of string size_type _...