大约有 43,000 项符合查询结果（耗时：0.0228秒） [XML]
How to split a string with any whitespace chars as delimiters
...lit() to split a String into an Array of substrings using all whitespace characters ( ' ' , '\t' , '\n' , etc.) as delimiters?
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Maximum number of records in a MySQL database table
...g with multiple billions of entries? (which would probably just make your select statements melt down long before then)
– Kzqai
Apr 26 '10 at 19:35
2
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memcpy() vs memmove()
...or you risk undefined behaviour, while the memory in memmove can overlap.
char a[16];
char b[16];
memcpy(a,b,16); // valid
memmove(a,b,16); // Also valid, but slower than memcpy.
memcpy(&a[0], &a[1],10); // Not valid since it overlaps.
memmove(&a[0], &a[1],10); ...
Will using 'var' affect performance?
... answered Nov 18 '09 at 14:42
RichardODRichardOD
27.4k88 gold badges5454 silver badges7676 bronze badges
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An efficient compression algorithm for short text strings [closed]
...tion you should ask is "what algorithm to compress text strings with these characteristics". For instance, if long repetitions are expected, simple Run-Lengh Encoding might be enough. If you can guarantee that only English words, spaces, punctiation and the occasional digits will be present, then Hu...
How to throw std::exceptions with variable messages?
...ptions can be constructed from a std::string:
#include <stdexcept>
char const * configfile = "hardcode.cfg";
std::string const anotherfile = get_file();
throw std::runtime_error(std::string("Failed: ") + configfile);
throw std::runtime_error("Error: " + anotherfile);
Note that the base cl...
Finding three elements in an array whose sum is closest to a given number
...We've found the answer.
The sum was too small. Move j closer to the end to select the next biggest number.
The sum was too big. Move k closer to the beginning to select the next smallest number.
For each i, the pointers of j and k will gradually get closer to each other. Eventually they will pass ...
How can I convert a std::string to int?
...i: cplusplus.com/reference/cstdlib/atoi "The string can contain additional characters after those that form the integral number, which are ignored and have no effect on the behavior of this function."
– Tin Wizard
Jul 25 '16 at 20:22
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Is there any use for unique_ptr with array?
...
here's a reason to not use vector: sizeof(std::vector<char>) == 24; sizeof(std::unique_ptr<char[]>) == 8
– Arvid
Sep 12 '14 at 22:34
15
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Is there a Boolean data type in Microsoft SQL Server like there is in MySQL? [duplicate]
...compared using a comparison operator such as =, <> or IS NULL. e.g.
SELECT
a.answer_body
FROM answers AS a
WHERE a.is_accepted = 0;
From a formatting perspective, a bit value is typically displayed as 0 or 1 in client software. When a more user-friendly format is required, and it can't ...