c++ - 使用 foreach 遍历向量

Question

以下代码：

std::vector< int > keysDown;
    for each ( int currentKey in keysDown )
    {

    }

正在引发智能感知错误：

1   IntelliSense: a 'for each' statement cannot operate on an expression of type "std::vector<int, std::allocator<int>>"

但它似乎可以编译和运行，有什么想法吗？

---

似乎没有遍历向量：

void Keyboard::AddKeyToVector( int key )
{
    keysDown.push_back( key );
}

void Keyboard::RemoveKeyFromVector( int key )
{
    std::vector< int > keysDown; // Placing this here for brevity, it's declared in the class's .h and is instanciated globally
    int i;
    for( int currentKey : keysDown ) 
    {
        if( currentKey == key )
        {
            keysDown.erase(keysDown.begin()+i);
        }
        i++;
    }
}