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Get string between two strings in a string
...ndex + fromLength, comparison) from strings like „AB” where A is from and B is until, so I removed + fromLength. I haven't tested it deeply though
– Adrian Iftode
Oct 16 '13 at 11:21
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Lambda capture as const reference?
...entifier
& identifier
this
The text only mention capture-by-copy and capture-by-reference and doesn't mention any sort of const-ness.
Feels like an oversight to me, but I haven't followed the standardization process very closely.
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了解 Boost Filesystem Library - C/C++ - 清泛网 - 专注C/C++及内核技术
...int main()
{
boost::filesystem::path path("/usr/local/include"); // random pathname
bool result = boost::filesystem::is_directory(path);
printf(“Path is a directory : %d\n”, result);
return 0;
}
此代码非常明了易懂，您并不需要了解任何系统特定的例程...
How to calculate date difference in JavaScript?
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There is no "simple" arithmetic for converting milliseconds to years. You must be aware of bissextile year, of timezone, and some days have 23 or 25 hours. Some years have 365,25 days, so there is no simple arithmetic here (still looking for an accurate solutio...
.NET data structures: ArrayList, List, HashTable, Dictionary, SortedList, SortedDictionary — Speed,
...of complex data structures. Unfortunately, some of them are quite similar, and I'm not always sure when to use one and when to use another. Most of my C# and Visual Basic books talk about them to a certain extent, but they never really go into any real detail.
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Check if a row exists, otherwise insert
...erbook a flight, as it will insert a new row when there are 10 tickets max and you are booking 20.
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JFrame in full screen Java
I will be doing a project soon and I will have to use full screen mode in it.
13 Answers
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How can I represent an 'Enum' in Python?
...TWO')
>>> Numbers.ZERO
0
>>> Numbers.ONE
1
Support for converting the values back to names can be added this way:
def enum(*sequential, **named):
enums = dict(zip(sequential, range(len(sequential))), **named)
reverse = dict((value, key) for key, value in enums.iteritems(...
Objective-C class -> string like: [NSArray className] -> @“NSArray”
...c. NSStringFromClass just pulls the name of the class from this struct and converts it to an NSString. Don't store the class name in a static NSString, it won't offer any performance advantage.
– dreamlax
Apr 10 '11 at 23:43
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Computed / calculated / virtual / derived columns in PostgreSQL
... Postgres 11 generated columns are not supported - as defined in the SQL standard and implemented by some RDBMS including DB2, MySQL and Oracle. Nor the similar "computed columns" of SQL Server.
STORED generated columns are introduced with Postgres 12. Trivial example:
CREATE TABLE tbl (
int1 ...