大约有 13,922 项符合查询结果（耗时：0.0997秒） [XML]
What is the advantage of using forwarding references in range-based for loops?
...
The only advantage I can see is when the sequence iterator returns a proxy reference and you need to operate on that reference in a non-const way. For example consider:
#include <vector>
int main()
{
std::vector<bool> v(10);
for (auto& e : v)
e = true;
}
This ...
What is the purpose of the single underscore “_” variable in Python?
..._ has 5 main conventional uses in Python:
To hold the result of the last executed expression(/statement) in an interactive
interpreter session. This precedent was set by the standard CPython
interpreter, and other interpreters have followed suit
As a general purpose "throwaway" variable name to ind...
Get GPS location from the web browser
...ll the browser support for geolocation is pretty good, all major browsers except ie7 and ie8 (and opera mini). IE9 does the job but is the worst performer. Checkout caniuse.com:
http://caniuse.com/#search=geol
Also you need the approval of your user to access their location, so make sure you check...
how to convert binary string to decimal?
...ic literals for integers, so if the binary string is immutable, as in the example code in the question, one could just type it in as it is with the prefix 0b or 0B:
var binary = 0b1101000; // code for 104
console.log(binary); // prints 104
...
get dictionary key by value
... lookup. You can do something like this:
var myKey = types.FirstOrDefault(x => x.Value == "one").Key;
If values are unique and are inserted less frequently than read, then create an inverse dictionary where values are keys and keys are values.
...
How to add google chrome omnibox-search support for your site?
When I enter some of URLs in Google Chrome omnibox, I see message in it "Press TAB to search in $URL". For example, there are some russian sites habrahabr.ru or yandex.ru. When you press TAB you'll be able to search in that site, not in your search engine.
How to make my site to be able for it? Mayb...
Recursive lambda functions in C++11
...may make more sense:
std::function<int(int,int)> sum;
sum = [term,next,&sum](int a, int b)->int {
if(a>b)
return 0;
else
return term(a) + sum(next(a),b);
};
Obviously, this wouldn't work with auto. Recursive lambda functions work perfectly well (at least they do in MSVC, ...
How does having a dynamic variable affect performance?
...namic used as a parameter or rather those lines with dynamic behavior/context(?)
Here's the deal.
For every expression in your program that is of dynamic type, the compiler emits code that generates a single "dynamic call site object" that represents the operation. So, for example, if you have:
...
What is the dual table in Oracle?
... answered Sep 16 '08 at 15:47
mfxmfx
6,5742323 silver badges2727 bronze badges
...
The way to check a HDFS directory's size?
I know du -sh in common Linux filesystems. But how to do that with HDFS?
10 Answers
...