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Iterate through a C++ Vector using a 'for' loop
I am new to the C++ language. I have been starting to use vectors, and have noticed that in all of the code I see to iterate though a vector via indices, the first parameter of the for loop is always something based on the vector. In Java I might do something like this with an ArrayList:
...
Circular gradient in android
...ying to make a gradient that emits from the middle of the screen in white, and turns to black as it moves toward the edges of the screen.
...
Why does InetAddress.isReachable return false, when I can ping the IP address?
...ll to the bottom to see my alternative for simply testing if you're online and capable of resolving external hosts (i.e. google.com) ... Which generally seems to work on *NIX machines.
The issue
There is alot of chatter about this :
Here are other, similar questions :
Detect internet Conne...
What is more efficient: Dictionary TryGetValue or ContainsKey+Item?
...y, 0);. But i think that TryGetValue is still more efficient since the get and set of the indexer property is used, isn't it?
– Tim Schmelter
Oct 1 '15 at 10:44
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How to define multiple CSS attributes in jQuery?
...rive-by downvoters who never read jquery documentation? numeric values are converted into pixel values automatically kthx.
– Jimmy
Jan 15 '09 at 21:10
5
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scoped_ptr 与 auto_ptr 与 shared_ptr 区别总结 - C/C++ - 清泛网 - 专注C/C++及内核技术
...
}
~Foo()
{
std::cout<<"destroy Foo()"<<std::endl;
}
void print()
{
std::cout<<"Foo::print"<<std::endl;
}
int i;
};
void OutSharePtr(shared_ptr<Foo> &P)
{
Foo* p = new Foo();
shared_ptr<Foo> sp1(p);
std::cout<<sp1.use_count()<<"::"<<sp1.get()<<std::endl;
shared...
boost自定义composite_key_compare比较函数 - C/C++ - 清泛网 - 专注C/C++及内核技术
...Index { };
struct TParamValidIndex { };
struct customize_compare
{
int operator()(const IDType l, const IDType r)const
{
// specially compare for this application
return strcmp(l, r);
}
};
typedef multi_index_container<
TParam_p,
indexed_by<
ordered_unique< tag<T...
解决：Run-Time Check Failure #0，The value of ESP was not properly sav...
... calling a function declared with one calling convention with a function pointer declared with a different calling convention.
错误原因：
你定义函数指针原型时出错。
其实你定义的没有错，但是编译器不认识而已，因为你调用的dll函数是一个远函数，而...
LVN_ITEMCHANGED通知会响应多次的问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
... pNMListView->uChanged && (pNMListView->uNewState & LVIS_SELECTED))
{
int nItem = pNMListView->iItem;
if(-1 != nItem)
{
int nSubItem = pNMListView->iSubItem;
CString str;
static int i = 0;
str.Format(_T("Index: %d, item: %d, subitem: %d"), i++, nItem, nSubItem);
GetPar...
mfc从CImageList中获取CBitmap位图对象 - C/C++ - 清泛网 - 专注C/C++及内核技术
...map位图对象
void GetListImage(CImageList &ImageList, CBitmap &Bitmap, int nImageIdx)
{
CClientDC dcClient(NULL);
IMAGEINFO ImageInfo;
ImageList.GetImageInfo(nImageIdx, &ImageInfo);
int nWidth = abs(ImageInfo.rcImage.right - ImageInfo.rcImage.left);
int nHeight = abs(Ima...