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Iteration over std::vector: unsigned vs signed index variable
...on't know. That will ensure your code runs as generic as possible.
Using Range C++11
for(auto const& value: a) {
/* std::cout << value; ... */
Using indices
for(std::vector<int>::size_type i = 0; i != v.size(); i++) {
/* std::cout << v[i]; ... */
}
Using arra...
What are the calling conventions for UNIX & Linux system calls (and user-space functions) on i386 an
...ll, register %rax contains the result of
the system-call. A value in the range between -4095 and -1 indicates
an error, it is -errno.
Only values of class INTEGER or class MEMORY are passed to the kernel.
Remember this is from the Linux-specific appendix to the ABI, and even for Linux it...
内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
...16个table，每个5M row。
OLTP_RO测试包含5个select查询：select_ranges, select_order_ranges, select_distinct_ranges, select_sum_ranges,
可以看到在多核心或者多线程的场景下， jemalloc和tcmalloc带来的tps增加非常明显。
参考资料
glibc内存管理ptmalloc...
Using TortoiseSVN how do I merge changes from the trunk to a branch and vice versa?
...two enable subversion 1.5's merge tracking.
TortoiseSVN's options merge a range or revisions maps to method 3 when your repository is 1.5+ or to method one when your repository is older.
When merging features over to a release/maintenance branch you should use the 'Merge a range of revisions' comm...
Get the last non-empty cell in a column in Google Sheets
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Question. If instead of A:A, there is an importrange(), how can this be rewritten without doing the same importrange() 4 times?
– Ruby
Mar 6 '19 at 21:54
...
Switch statement for greater-than/less-than
...switch-immediate 2.0 1.1 2.0 1.0 2.8 1.3
switch-range 38.1 10.6 2.6 7.3 20.9 10.4
switch-range2 31.9 8.3 2.0 4.5 9.5 6.9
switch-indirect-array 35.2 9.6 4.2 5.5 10.7 8.6
array-linear-switch 3.6 ...
Performance of Arrays vs. Lists
...Array need to use:
So often as possible. It's fast and takes smallest RAM range for same amount information.
If you know exact count of cells needed
If data saved in array < 85000 b (85000/32 = 2656 elements for integer data)
If needed high Random Access speed
List need to use:
If needed to a...
Python Regex - How to Get Positions and Values of Matches
...Z])"
for match in re.finditer(regex_with_3_groups, string):
for idx in range(0, 4):
print(match.span(idx), match.group(idx))
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UnicodeDecodeError: 'ascii' codec can't decode byte 0xd1 in position 2: ordinal not in range(128)
...'ascii' codec can't encode character u'\xf1' in position 2: ordinal not in range(128)
– Vikash Mishra
Nov 21 '16 at 13:45
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Advantage of switch over if-else statement
...l throw an exception on out-of-bounds values. (bitset::operator[] doesn't range-check). cplusplus.com/reference/bitset/bitset/test. This will probably outperform a compiler-generated jump table implementing switch, esp. in the not-special case where this will be a single not-taken branch.
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