大约有 4,600 项符合查询结果（耗时：0.0224秒） [XML]
OpenCV C++/Obj-C: Detecting a sheet of paper / Square Detection
...some modifications to the squares demo present in OpenCV and the resulting C++ code below is able to detect a sheet of paper in the image:
void find_squares(Mat& image, vector<vector<Point> >& squares)
{
// blur will enhance edge detection
Mat blurred(image);
medianB...
Is there a __CLASS__ macro in C++?
Is there a __CLASS__ macro in C++ which gives the class name similar to __FUNCTION__ macro which gives the function name
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Is Ruby pass by reference or by value?
...value nor pass by reference, at least in the sense those terms are used in C++. "pass by object reference" might be a better way to describe what Ruby does. In the end though, the best bet might be not to put too much meaning on any of these terms, and just get a good understanding of the behavior t...
Free XML Formatting tool [closed]
...t looks simple, however it contains a custom written XML parser written in C++ that allows it to work efficiently with very large XML files easily (unlike some expensive "espionage" related tools I've used).
From the product page:
The full Visual C++ source code for this firstobject XML editor
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What does template mean?
...
@bobobobo this was answered before C++11 and constexpr.
– Justin Meiners
Nov 16 '18 at 22:25
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What is the “-->” operator in C++?
After reading Hidden Features and Dark Corners of C++/STL on comp.lang.c++.moderated , I was completely surprised that the following snippet compiled and worked in both Visual Studio 2008 and G++ 4.4.
...
How to avoid “if” chains?
...ltogether.
Option 1. You can't do this: use finally
Unfortunately, as a c++ developer, you can't do this. But this is the number one answer for languages that contain a finally keyword, since this is exactly what it is for.
try
{
if (!ok)
{
_log.Error("oops");
return;
...
The program can't start because libgcc_s_dw2-1.dll is missing
I have created a simple program in C++ with Code::Blocks.
16 Answers
16
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Determine if map contains a value for a key?
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Obviously you can write your own getValue() routine if you want (also in C++, there is no reason to use out), but I would suspect that once you get the hang of using std::map::find() you won't want to waste your time.
Also your code is slightly wrong:
m.find('2'); will search the map for a keyva...
Python - Create a list with initial capacity
...3587.204933ms
doAllocate: 2701.154947ms
doGenerator: 1721.098185ms
While C++ gives (built with MSVC, 64-bit, Optimizations enabled)
Elements: 100000, Iterations: 144
doAppend: 74.0042ms
doReserve: 27.0015ms
doAllocate: 5.0003ms
C++ debug build produces:
Elements: 100000, Iterations: 144
doAppe...