C++ 将 std::vector 转换为数组
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Convert std::vector to array
提问by SideEffect
I have a library which expects a array and fills it. I would like to use a std::vector instead of using an array. So instead of
我有一个需要数组并填充它的库。我想使用 std::vector 而不是使用数组。所以代替
int array[256];
object->getArray(array);
I would like to do:
我想要做：
std::vector<int> array;
object->getArray(array);
But I can't find a way to do it. Is there any chance to use std::vector for this?
但我找不到办法做到这一点。有没有机会为此使用 std::vector ？
Thanks for reading!
谢谢阅读！
EDIT: I want to place an update to this problem: I was playing around with C++11 and found a better approach. The new solution is to use the function std::vector.data() to get the pointer to the first element. So we can do the following:
编辑：我想更新这个问题：我在玩 C++11 并找到了一个更好的方法。新的解决方案是使用函数 std::vector.data() 来获取指向第一个元素的指针。所以我们可以做到以下几点：
std::vector<int> theVec;
object->getArray(theVec.data()); //theVec.data() will pass the pointer to the first element
If we want to use a vector with a fixed amount of elements we better use the new datatype std::array instead (btw, for this reason the variable name "array", which was used in the question above should not be used anymore!!).
如果我们想使用具有固定数量元素的向量，我们最好使用新的数据类型 std::array 代替（顺便说一句，由于这个原因，不应再使用上面问题中使用的变量名称“array”！ ！）。
std::array<int, 10> arr; //an array of 10 integer elements
arr.assign(1); //set value '1' for every element
object->getArray(arr.data());
Both code variants will work properly in Visual C++ 2010. Remember: this is C++11 Code so you will need a compiler which supports the features!
两种代码变体都可以在 Visual C++ 2010 中正常工作。请记住：这是 C++11 代码，因此您需要一个支持这些功能的编译器！
The answer below is still valid if you do not use C++11!
如果您不使用 C++11，下面的答案仍然有效！
回答by GManNickG
Yes:
是的：
std::vector<int> array(256); // resize the buffer to 256 ints
object->getArray(&array[0]); // pass address of that buffer
Elements in a vectorare guaranteed to be contiguous, like an array.
avector中的元素保证是连续的，就像数组一样。
