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how to use #ifdef with an OR condition?
Sorry for asking very basic question. I would like to set OR condition in #ifdef directive.?
How to do that ?
I tried
2 Ans...
How to get a list of all valid IP addresses in a local network? [closed]
Is there a way to get a list of all valid IP addresses in a local network?
3 Answers
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Only mkdir if it does not exist [duplicate]
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Do a test
[[ -d dir ]] || mkdir dir
Or use -p option:
mkdir -p dir
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Should I be using Protractor or Karma for my end-to-end testing? [closed]
Should I be using Protractor or Karma for my end-to-end testing?
1 Answer
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std::mutex 加锁抛 _DEVICE_OR_RESOURCE_BUSY 异常 - C/C++ - 清泛网 - 专注C/C++及内核技术
std::mutex 加锁抛 _DEVICE_OR_RESOURCE_BUSY 异常device_or_resource_busy最近遇到一个崩溃，在 std::lock_guard<std::mutex> lock(mutex_); 的地方，抛出了_DEVICE_OR_RESOURCE_BUSY 的异常。最终查出原因是：同一个线程对同一个mutex二次加锁导致的 最近遇到...
Maximum number of items that can be serialized or deserialized in an o...
Maximum number of items that can be serialized or deserialized in an object grap报错消息：Maximum number of items that can be serialized or deserialized in an object graph is '65536'. Ch...报错消息：
Maximum number of items that can be serialized or deserialized in an object graph is '655...
解决：apache2.service: Failed to run \'start\' task: No such file or d...
解决：apache2.service: Failed to run 'start' task: No such file or directoryapache2-service-failed-to-run-start-task-no-such-file-or-directory今天重启apache2时，出现一个错误：apache2 service: Failed to run & 39;start& 39; task: No such file or directory。原因是：& 39; var tmp& 3...
Which characters are illegal within a branch name?
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Naming rules for refname:
Git imposes the following rules on how references are named:
They can include slash / for hierarchical (directory) grouping, but no slash-separated component can begin with a dot . or end with the sequence .lock...
What exactly is a reentrant function?
...ly executed concurrently, does it always mean that it is reentrant?
No.
For example, let's have a C++ function that takes both a lock, and a callback as a parameter:
#include <mutex>
typedef void (*callback)();
std::mutex m;
void foo(callback f)
{
m.lock();
// use the resource pro...
How to determine whether an object has a given property in JavaScript
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Object has property:
If you are testing for properties that are on the object itself (not a part of its prototype chain) you can use .hasOwnProperty():
if (x.hasOwnProperty('y')) {
// ......
}
Object or its prototype has a property:
You can use the in operato...