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c++ boost::multi_index composite keys efficiency - c++1y / stl - 清泛IT社区，为创新赋能！
... this:
struct element_cmp
{
bool operator()(const element& v1, const element& v2)const
{
if(v1.x<v2.x)return true;
if(v2.x<v1.x)return false;
if(v1.y<v2.y)return true;
if(v2.y<v1.y)return false;
 ...
MySql export schema without data
...nclude the view definition. So if yo had a view like following
create view v1
select `a`.`id` AS `id`,
`a`.`created_date` AS `created_date`
from t1;
with --no-data option, view definition will get changed to following
create view v1
select 1 AS `id`, 1 AS `created_date`
...
内存调试技巧：C 语言最大难点揭秘 - C/C++ - 清泛网 - 专注C/C++及内核技术
...于应用程序甚至（在极端情况下）不同进程中的其他执行位置。
悬空指针可能发生在以微妙方式使用内存的代码中。结果是，即使内存在释放后立即被覆盖，并且新指向的值不同于预期值，也很难识别出新值是错误值。
悬空...
Quicksort vs heapsort
.../~jmor159/PLDS210/qsort3.html, the heap sort takes 2,842 comparisons for n=100, but it takes 53,113 comparisons for n=500. And that implies the ratio between n=500 and n=100 is 18 times, and it is NOT matching the heap sort algorithm with O(N logN) complexity. I guess it's pretty likely that their h...
Entity Framework rollback and remove bad migration
...
For those using EF Core with ASP.NET Core v1.0.0 I had a similar problem and used the following commands to correct it (@DavidSopko's post pointed me in the right direction, but the details are slightly different for EF Core):
Update-Database <Name of last good m...
Determine installed PowerShell version
...ne running PowerShell 3, you get back 1.0, as the RemotingHost seems to be v1. Using $PSVersionTable correctly returns 3.
– Danny Tuppeny
Oct 30 '12 at 9:30
25
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How to use git bisect?
...t # Starting bisect
$ git bisect bad # stating that the current commit (v1.5) has the regression/ setting 'bad' point
$ git bisect good v1.0 # mentioning it the last good working commit (without regression)
This mentioning of 'bad' and 'good' points will help git bisect (binary search) pick th...
What do the numbers in a version typically represent (i.e. v1.9.0.1)?
...
In version v1.9.0.1:
This is the explicit versioning scheme used when you don't want to use name for the pre-releases or build like -alpha,-beta.
1:Major version which might break the backward compatibility
9:Adding of new features to...
Where Is Machine.Config?
...ramework64\[version]\config\machine.config
[version] should be equal to v1.0.3705, v1.1.4322, v2.0.50727 or v4.0.30319.
v3.0 and v3.5 just contain additional assemblies to v2.0.50727 so there should be no config\machine.config. v4.5.x and v4.6.x are stored inside v4.0.30319.
...
How to echo with different colors in the Windows command line
...ite[0m
echo.
echo [101;93m STRONG BACKGROUND COLORS [0m
echo ^<ESC^>[100m [100mBlack[0m
echo ^<ESC^>[101m [101mRed[0m
echo ^<ESC^>[102m [102mGreen[0m
echo ^<ESC^>[103m [103mYellow[0m
echo ^<ESC^>[104m [104mBlue[0m
echo ^<ESC^>[105m [105mMagenta[0m
echo ^<ESC^&g...