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What’s the best way to check if a file exists in C++? (cross platform)
...
Use boost::filesystem:
#include <boost/filesystem.hpp>
if ( !boost::filesystem::exists( "myfile.txt" ) )
{
std::cout << "Can't find my file!" << std::endl;
}
...
Creating a simple XML file using python
...st popular (and very simple) option is the ElementTree API,
which has been included in the standard library since Python 2.5.
The available options for that are:
ElementTree (Basic, pure-Python implementation of ElementTree. Part of the standard library since 2.5)
cElementTree (Optimized C imple...
Does “untyped” also mean “dynamically typed” in the academic CS world?
... use the lambda calculus add base types and constants, and then you either include a static type system for lambda or you are right back to dynamic type tags.
P.P.S. To original poster: when it comes to programming languages, and especially type systems, the information on Wikipedia is of poor qual...
ros 基本调试 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...循以上特点的文件可以被轻易识别出来。
#define NDEBUG
#include 〈debug.h〉
如果想要完全开启verbosity功能，只需要将"#define NDEBUG"这行注释掉即可，注意在提交补丁时要将注释符号去掉。
加入我们的调试消息
首先要确保已经包含...
How can I wait for set of asynchronous callback functions?
...re already using jQuery for Ajax. But, I've updated it in several ways to include native promises.
– jfriend00
Nov 19 '15 at 22:04
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Intel HAXM installation error - This computer does not support Intel Virtualization Technology (VT-x
... from Android Studio) Before starting the install, run the haxm_check.exe included in the download from command line. If your fix worked, it should show yes for both NX and VT.
If you just double click haxm_check.exe you won't see anything. Run it from cmd or powershell to see the output.
Chec...
Setup RSpec to test a gem (not Rails)
...spec, and you need to tell it where your app is, where your files are, and include the file you want to test (along with any dependencies it has):
# spec/awesome_gem/awesome.rb
APP_ROOT = File.expand_path(File.join(File.dirname(__FILE__), '..', '..'))
$: << File.join(APP_ROOT, 'lib/awesome_ge...
Preserve HTML font-size when iPhone orientation changes from portrait to landscape
...
You could also opt for using a CSS reset, such as normalize.css, which includes the same rule that crazygringo recommends:
/**
* 2. Prevent iOS text size adjust after orientation change, without disabling
* user zoom.
*/
html {
-ms-text-size-adjust: 100%;
-webkit-text-size-adjust: 10...
What does the Q_OBJECT macro do? Why do all Qt objects need this macro?
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The MOC (meta object compiler) converts the Q_OBJECT macro included header files in to C++ equivalent source code.
It basically controls the signal-slot mechanism, and makes it understandable to the C++ compiler
...
How can “while (i == i) ;” be a non-infinite loop in a single threaded application?
...
double i = Double.NaN;
NaN is not equal to anything, including itself.
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