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What C++ Smart Pointer Implementations are available?
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C++03
std::auto_ptr - Perhaps one of the originals it suffered from first draft syndrome only providing limited garbage collection facilities. The first downside being that it calls delete upon destruction making them unacceptable for holding array alloca...
How to set child process' environment variable in Makefile
...puts the correct expansion for the first row, but only echo for the second one. PROJ_ROOT is not set after running make. Spaces around = give "bad variable name" for export. Having the first row as prerequisite as in your example gives "commands commence before first target"
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Is there a way for multiple processes to share a listening socket?
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So for one connection, either parent or child gets it. But who gets the connection is indeterministic, right?
– Hot.PxL
May 2 '15 at 5:36
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JavaScript query string [closed]
...mp;]*)/g, m;
while (m = re.exec(queryString)) {
result[decodeURIComponent(m[1])] = decodeURIComponent(m[2]);
}
return result;
}
// ...
var myParam = getQueryString()["myParam"];
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How can I efficiently select a Standard Library container in C++11?
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Not that I know of, however it can be done textually I guess. Also, the chart is slightly off, because list is not such a good container in general, and neither is forward_list. Both lists are very specialized containers for niche applications.
To build such a ch...
What is the point of interfaces in PHP?
...ses?
To prevent multiple inheritance (can cause multiple known problems).
One of such problems:
The "diamond problem" (sometimes referred to as the "deadly diamond of
death") is an ambiguity that arises when two classes B and C inherit
from A and class D inherits from both B and C. If there...
How do I return multiple values from a function in C?
...ng();
}
void foo() {
int a, b;
getPair(&a, &b);
}
Which one you choose to use depends largely on personal preference as to whatever semantics you like more.
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is vs typeof
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They don't do the same thing. The first one works if obj is of type ClassA or of some subclass of ClassA. The second one will only match objects of type ClassA. The second one will be faster since it doesn't have to check the class hierarchy.
For those who want ...
How to generate a random string in Ruby
...ime golfing.
(0...50).map { ('a'..'z').to_a[rand(26)] }.join
And a last one that's even more confusing, but more flexible and wastes fewer cycles:
o = [('a'..'z'), ('A'..'Z')].map(&:to_a).flatten
string = (0...50).map { o[rand(o.length)] }.join
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如何选择机器学习算法 - 大数据 & AI - 清泛网移动版 - 专注C/C++及内核技术
...eally care about accuracy, your best bet is to test out a couple different ones (making sure to try different parameters within each algorithm as well), and select the best one by cross-validation. But if you’re simply looking for a “good enough” algorithm for your problem, or a place to s...