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How to store a command in a variable in a shell script?
...o check and confirm this, you cand do:
echo test;
X=$(for ((c=0; c<=5; c++)); do
sleep 2;
done);
echo note the 5 seconds elapsed
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技术人员如何去面试？ - 杂谈 - 清泛网 - 专注C/C++及内核技术
...试不同的技术应该问的问题都不相同，比如你PHP、Java、C++、数据库每个技术点不同，出的面试题自然不同，最好你在找工作的时候就选择跟你个人擅长技术比较符合的职位。
技术面试的流程是一面简单问题(基础知识、数据结...
Visual Studio: How do I show all classes inherited from a base class?
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Visual Studio 6 had it on C++ projects nearly 20 years ago. The object browser and class diagram don't provide the same light weight ability to flip inheritance trees. I recently found that Eclipse has a great version of this, with Java at least. Co...
Copy a file in a sane, safe and efficient way
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With C++17 the standard way to copy a file will be including the <filesystem> header and using:
bool copy_file( const std::filesystem::path& from,
const std::filesystem::path& to);
bool copy_file( c...
What does {0} mean when initializing an object?
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Not quite.. In C++, if the first member cannot be zero-constructed then {0} will not work. Ex: struct A { B b; int i; char c; }; struct B { B(); B(string); }; A a = {}; // this statement cannot be rewritten as 'A a = {0}'.
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Factory pattern in C#: How to ensure an object instance can only be created by a factory class?
...r directly? The first natural desire to use a good old "friend" keyword of C++ will fall short with C#. So we need other options...
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Array versus List: When to use which?
...d with performance, and by that I mean, "Why are you using .Net instead of C++?" you should stick with List<>. It's easier to maintain and does all the dirty work of resizing an array behind the scenes for you. (If necessary, List<> is pretty smart about choosing array sizes so it doesn'...
List of MSBuild built-in variables
...be defined by 3rd-party tools so to get the complete list I just use (in a C++ project for example): Properties -> Configuration Properties -> General -> then on the Output or Intermediate Directory drop down choose Edit... and you should see a list of all defined properties.
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Indenting #defines
...e idea of indenting pre-processor macro. I do not have a copy of the C or C++ standard though so I do not know if this is standard behavior or not.
As to whether or not it's good style. Personally, I like the idea of keeping them all to the left. It gives you a consistent place to look for the...
What's the difference between := and = in Makefile?
...CC} file.c is executed. However, if the variable GCC is reassigned i.e
GCC=c++ then the ${CC} will be converted to c++ -W after the reassignment.
Conditional assignment ?=
Conditional assignment assigns a value to a variable only if it does not have a value
Appending +=
Assume that CC = gcc ...