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sgi-stl's Issues

关于 Test的一个问题

在你的test目录下面,这里调用的还是默认的stl的代码,并不是你仓库里面的sgi-stl的代码。test里面调用的应该是 /usr/include/c++/5.x 里面的代码吧?

请问,你有没有调用过仓库里面的sgi-stl的的源码?

下面是你的test文件

#include <iostream>
#include <vector>
using namespace std;
template <typename T>
void printVector(const vector<T>& vec)
{
	for (auto x : vec) {
		cout << x << " ";
	}
	cout << endl;
}
int main()
{
	// 构造函数:四种形式
	vector<string> iv(2, "hi");
        // ....
}

Problem about SGI-STL V3.3/stl_alloc.h __default_alloc_template::_S_chunk_alloc

if (__bytes_left > 0) {
_Obj* __STL_VOLATILE* __my_free_list =
_S_free_list + _S_freelist_index(__bytes_left);
((_Obj*)_S_start_free) -> _M_free_list_link = *__my_free_list;
*__my_free_list = (_Obj*)_S_start_free;
}

I think this logic is only correct when __bytes_left is a multiple of 8,
otherwise, __bytes_left would be less than the chunk size of the computed slot.
For example, if __bytes_left is 5, the computed slot is 0, with chunk size of 8, if caller function requests 7 bytes of memory, normally allocator returns 8 bytes of memory, but this chunk has only 5, which would be not enough.

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