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What is the difference between NULL, '\0' and 0?
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Note: This answer applies to the C language, not C++.
Null Pointers
The integer constant literal 0 has different meanings depending upon the context in which it's used. In all cases, it is still an integer constant with the value 0, it is just described in different way...
vector::at vs. vector::operator[]
... its boundary checking, which is also discussed in similar questions like C++ Vector at/[] operator speed or ::std::vector::at() vs operator[] << surprising results!! 5 to 10 times slower/faster! . I just don't understand what the at() method is good for.
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Why don't Java Generics support primitive types?
... @DanyalAytekin - In fact, Java generics are NOT handled like C++ templates at all ...
– Stephen C
Mar 26 '12 at 1:32
22
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Downcasting shared_ptr to shared_ptr?
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@Tim Sylvester: but, C++ is not a "perfect" OO language! :-) down-casts have their place in a non-perfect OO language
– Steve Folly
Aug 31 '09 at 22:17
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Threading in a PyQt application: Use Qt threads or Python threads?
...Python manages the execution between threads), you release it when you run C++ code. There is no difference at all.
– Lukáš Lalinský
Oct 29 '09 at 12:05
1
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How can you find the height of text on an HTML canvas?
... while(!last && r) {
r--;
for(c = 0; c < width; c++) {
if(data[r * width * 4 + c * 4 + 3]) {
last = r;
break;
}
}
}
// Find the first line with a non-white pixel
while(r) {
r--;
fo...
Difference between `const shared_ptr` and `shared_ptr`?
I'm writing an accessor method for a shared pointer in C++ that goes something like this:
4 Answers
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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
mfc从CImageList中获取CBitmap位图对象通过图像的索引号从CImageList中获取CBitmap位图对象的函数如下： CImageList中获取CBitmap位图对象void GetListImage(CImageList &Imag...通过位图的索引号从CImageList中获取CBitmap位图对象的函数如下：
//CImageL...
error C2804:binary \'operator +\' has too many parameters - C/C++ - 清泛网 - 专注C/C++及内核技术
...操作数，应该重载为普通非成员函数。
注意重载操作符的形参数目（包括成员函数的隐式 this 指针）与操作符的操作数数目相同。对称的操作符，如算术操作符、相等操作符、关系操作符和位操作符，最好定义为普通非成员函...
error C2280: \'std::mutex::mutex(const std::mutex &)\' : attempting to...
...ex &)' : attempting to reference a deleted functionstd::mutex是noncopyable的结构，因此不存在拷贝构造函数，所以这里错误提示引用已经删除的函数。错误示例代码如下：解决方法：将包含std::...std::mutex是noncopyable的结构，因此不存在拷贝构造...