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How do I check if a C++ std::string starts with a certain string, and convert a substring to an int?
...only match at that position or earlier. For example:
std::string test = "0123123";
size_t match1 = test.rfind("123"); // returns 4 (rightmost match)
size_t match2 = test.rfind("123", 2); // returns 1 (skipped over later match)
size_t match3 = test.rfind("123", 0); // returns std::string::npos (i...
Java: How to set Precision for double value? [duplicate]
...ts.
If you only want to print, use it this way:
System.out.printf("%.2f",123.234);
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Regular Expression to reformat a US phone number in Javascript
...
Assuming you want the format "(123) 456-7890":
function formatPhoneNumber(phoneNumberString) {
var cleaned = ('' + phoneNumberString).replace(/\D/g, '')
var match = cleaned.match(/^(\d{3})(\d{3})(\d{4})$/)
if (match) {
return '(' + match[1] + ')...
Git - working on wrong branch - how to copy changes to existing topic branch
...
Sounds like all you need is the following:
git stash
git checkout branch123
git stash apply
Then you should be back on your own branch without touching the master branch.
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Difference between author and committer in Git?
...ou can either:
format the log specifically for that:
git log --pretty='%cn %cd' -n1 HEAD
where cn and cd stand for Committer Name and Committer Date
use the fuller predefined format:
git log --format=fuller
See also: How to configure 'git log' to show 'commit date'
go low level and show the ...
How to use mongoimport to import csv
...of MongoDB?
$ cat > locations.csv
Name,Address,City,State,ZIP
Jane Doe,123 Main St,Whereverville,CA,90210
John Doe,555 Broadway Ave,New York,NY,10010
ctrl-d
$ mongoimport -d mydb -c things --type csv --file locations.csv --headerline
connected to: 127.0.0.1
imported 3 objects
$ mongo
MongoDB sh...
C#操作XML小结 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...mlSchema("your xmlfile name");
第二种方法：
<aaa>
<add key="123" value="321"/>
</aaa>
如果我要找到123然后取到321应该怎么写呢？
using System.XML;
XmlDataDocument xmlDoc = new System.Xml.XmlDataDocument();
xmlDoc.Load(@"c:/Config.xml");
XmlElement elem = xmlDoc....
Is R's apply family more than syntactic sugar?
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The apply functions in R don't provide improved performance over other looping functions (e.g. for). One exception to this is lapply which can be a little faster because it does more work in C code than in R (see this question for an ...
Type erasure techniques
...
All type erasure techniques in C++ are done with function pointers (for behaviour) and void* (for data). The "different" methods simply differ in the way they add semantic sugar. Virtual functions, e.g., are just semantic sugar for
struct Class {
struct vtable {
...
Abandoning changes without deleting from history
...r you is to mark the old branch as "closed". If your old head is revision "123" then:
hg update -r 123
hg commit --close-branch -m 'Closing old branch'
hg update -C default
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