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C++ error: undefined reference to 'clock_gettime' and 'clock_settime'
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example:
c++ -Wall filefork.cpp -lrt -O2
For gcc version 4.6.1, -lrt must be after filefork.cpp otherwise you get a link error.
Some older gcc version doesn't care about the position.
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When to use references vs. pointers
...better option would be to use something similar to std::optional (requires C++17; before that, there's boost::optional).
Another example is to use pointers to raw memory for specific memory manipulations. That should be hidden and localized in very narrow parts of the code, to help limit the dangero...
How do I convert a double into a string in C++?
...::string str = boost::lexical_cast<std::string>(dbl);
The Standard C++ way:
std::ostringstream strs;
strs << dbl;
std::string str = strs.str();
Note: Don't forget #include <sstream>
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C++ Build Systems - What to use? [closed]
I'm looking at starting a new project in C++ - just in my own time initially - and I'm investigating the build systems that are available. It would appear that the answer is "Many, and they're all awful".
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Internal typedefs in C++ - good style or bad style?
...ames as much as possible, and use of classes is the best way to do this in C++. For example, the C++ Standard library makes heavy use of typedefs within classes.
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CDC:DrawText 多行显示文本（文本自动换行） - C++ UI - 清泛IT社区，为创新赋能！
//长文本自动换行
dc.DrawText(str, &rect, DT_LEFT | DT_TOP | DT_WORDBREAK | DT_EDITCONTROL, m_pfSongTi);
函数原型：
int DrawText(
HDC hDC, // handle to DC
LPCTSTR lpString, // text to draw
int nCount,...
C++ semantics of `static const` vs `const`
In C++ specifically, what are the semantic differences between for example:
2 Answers
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Creating an object: with or without `new` [duplicate]
...most appropriate.
Use the former unless you need to use the latter.
Your C++ book should cover this pretty well. If you don't have one, go no further until you have bought and read, several times, one of these.
Good luck.
Your original code is broken, as it deletes a char array that it did not...
Purpose of Unions in C and C++
...oSantilli新疆改造中心六四事件法轮功 A part of an example from C++ Primer, might help. wandbox.org/permlink/cFSrXyG02vOSdBk2
– Rick
Sep 29 '18 at 11:42
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