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Why can I not push_back a unique_ptr into a vector?
...correct. You cannot use it to manage a pointer to a local variable. The lifetime of a local variable is managed automatically: local variables are destroyed when the block ends (e.g., when the function returns, in this case). You need to dynamically allocate the object:
std::unique_ptr<int&g...
Return None if Dictionary key is not available
I need a way to get a dictionary value if its key exists, or simply return None , if it does not.
11 Answers
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iPhone - Get Position of UIView within entire UIWindow
... the bounds of the window. The screen's and device coordinate systems are different and should not be mixed up with window coordinates.
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Include jQuery in the JavaScript Console
...xample, on a website I would like to get the number of rows in a table. I know this is really easy with jQuery.
20 Answers
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When should I use perror(“…”) and fprintf(stderr, “…”)?
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@R.., ha, I already have, and as far as I know they are not paying me a thing. And since MS seems to be cutting their support for C completely, at the end I will be the only one :) strerror_s is actually not too bad as an interface.
– Jens Gusted...
Jackson Vs. Gson [closed]
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Gson 1.6 now includes a low-level streaming API and a new parser which is actually faster than Jackson.
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Using Enum values as String literals
...you have FOUR options here. All four offer a solution but with a slightly different approach...
Option One: use the built-in name() on an enum. This is perfectly fine if you don't need any special naming format.
String name = Modes.mode1.name(); // Returns the name of this enum constant, exact...
Adding external library into Qt Creator project
...rary name (without the extension and without any 'lib' prefix). Of course, if you are including a Windows specific lib, this really doesn't matter.
In case you want to store your lib files in the project directory, you can reference them with the $$_PRO_FILE_PWD_ variable, e.g.:
LIBS += -L"$$_PRO_...
OpenSSH升级后不能登录的问题 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...d for options in the default sshd_config shipped with
# OpenSSH is to specify options with their default value where
# possible, but leave them commented. Uncommented options override the
# default value.
# If you want to change the port on a SELinux system, you have to tell
# SELinux about ...
Shell脚本编程30分钟入门 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...PHP等语言不一样，sh的流程控制不可为空，如：
<?php
if (isset($_GET["q"])) {
search(q);
}
else {
//do nothing
}
在sh/bash里可不能这么写，如果else分支没有语句执行，就不要写这个else。
还要注意，sh里的if [ $foo -eq 0 ]，这个方括...