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Possible Duplicate:
Can I call functions that take an array/pointer argument using a std::vector instead?
我最近遇到了这样的事情:
class X {
public: void foo(float* p, int elements);
};
= 需要一个浮点值数组的方法。
但在示例代码中，这是他们使用它的方式:
std::vector<float> bar;
bar.push_back(42);
// ...
X x;
x.foo( &bar[0], (int)bar.size() );
现在我想知道这是否是一种安全的方法，或者恰好适用于 std::vector 的大多数实现？ (也许这是一个运算符重载的问题？我对这些东西还没有那么自信..)
最佳答案
是的，它很安全。
n3337 23.3.6.1/1。在 C++03 标准中，这是 23.2.4/1
A vector is a sequence container that supports random access iterators. In addition, it supports (amortized) constant time insert and erase operations at the end; insert and erase in the middle take linear time. Storage management is handled automatically, though hints can be given to improve efficiency. The elements of a vector are stored contiguously, meaning that if v is a vector where T is some type other than bool, then it obeys the identity &v[n] == &v[0] + n for all 0 <= n < v.size().
关于c++ - 当需要数组时，将指针传递给 vector 中的第一个元素是否安全？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/12144246/