mirror of
https://github.com/huihut/interview.git
synced 2024-03-22 13:10:48 +08:00
commit
d5ce4377f7
37
STL/STL.md
37
STL/STL.md
|
@ -401,19 +401,19 @@ Example
|
|||
#include <iostream>
|
||||
#include <array>
|
||||
|
||||
int main ()
|
||||
int main()
|
||||
{
|
||||
std::array<int,10> myarray;
|
||||
std::array<int, 10> myarray;
|
||||
unsigned int i;
|
||||
|
||||
// assign some values:
|
||||
for(i=0; i<10; i++)
|
||||
for (i = 0; i<10; i++)
|
||||
myarray[i] = i;
|
||||
|
||||
// print content
|
||||
std::cout << "myarray contains:";
|
||||
for(i=0; i<10; i++)
|
||||
std::cout << ' ' << myarray[i];
|
||||
for (i = 0; i<10; i++)
|
||||
std::cout << ' ' << myarray.at(i);
|
||||
std::cout << '\n';
|
||||
|
||||
return 0;
|
||||
|
@ -1608,6 +1608,33 @@ Output
|
|||
```
|
||||
The allocated array contains: 0 1 2 3 4
|
||||
```
|
||||
|
||||
注意:deallocate和destory的关系:
|
||||
|
||||
deallocate实现的源码:
|
||||
|
||||
template <class T>
|
||||
inline void _deallocate(T* buffer)
|
||||
{
|
||||
::operator delete(buffer); //为什么不用 delete [] ? ,operator delete 区别于 delete
|
||||
//operator delete 是一个底层操作符
|
||||
}
|
||||
|
||||
destory:
|
||||
|
||||
template <class T>
|
||||
inline void _destory(T *ptr)
|
||||
{
|
||||
ptr->~T();
|
||||
}
|
||||
|
||||
destory负责调用类型的析构函数,销毁相应内存上的内容(但销毁后内存地址仍保留)
|
||||
|
||||
deallocate负责释放内存(此时相应内存中的值在此之前应调用destory销毁,将内存地址返回给系统,代表这部分地址使用引用-1)
|
||||
|
||||
|
||||
|
||||
|
||||
#### relational operators (vector)
|
||||
#### swap (vector)
|
||||
#### vector <bool>
|
||||
|
|
Loading…
Reference in New Issue
Block a user