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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...
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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.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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Most efficient method to groupby on an array of objects
... })
};
});
};
group.register = function(name, converter) {
return group[name] = function(data, names) {
return _.map(group(data, names), converter);
};
};
return group;
}());
DataGrouper.register("sum", function(item) {
return _....
SET versus SELECT when assigning variables?
What are the differences between the SET and SELECT statements when assigning variables in T-SQL?
4 Answers
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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 ...
php中json_decode()和json_encode()的使用方法 - 更多技术 - 清泛网 - 专注C/C++及内核技术
..., true));
?>
上例将输出：
object(stdClass)#1 (5) {
["a"] => int(1)
["b"] => int(2)
["c"] => int(3)
["d"] => int(4)
["e"] => int(5)
}
array(5) {
["a"] => int(1)
["b"] => int(2)
["c"] => int(3)
["d"] => int(4)
["e"] => int(5)
}
$data='[
{"Name":"a1","Num...