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c++ boost库 序列化与反序列化 - C/C++ - 清泛网 - 专注C/C++及内核技术
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#include "boost/serialization/vector.hpp"
#include "boost/serialization/set.hpp"
#include "boost/serialization/string.hpp"
#include "boost/serialization/shared_ptr.hpp"
//
const unsigned int SERIALIZATION_VERSION = 1;
//保存结构体数据
template<typename TemplateStruct> int save(const ...
Order Bars in ggplot2 bar graph
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The key with ordering is to set the levels of the factor in the order you want. An ordered factor is not required; the extra information in an ordered factor isn't necessary and if these data are being used in any statistical model, the wrong parametris...
Remove Identity from a column in a table
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You cannot remove an IDENTITY specification once set.
To remove the entire column:
ALTER TABLE yourTable
DROP COLUMN yourCOlumn;
Information about ALTER TABLE here
If you need to keep the data, but remove the IDENTITY column, you will need to:
Create a new column
Tra...
How can I pad an int with leading zeros when using cout
...ip>
#include <iostream>
int main()
{
std::cout << std::setfill('0') << std::setw(5) << 25;
}
the output will be
00025
setfill is set to the space character (' ') by default. setw sets the width of the field to be printed, and that's it.
If you are interested i...
Multiple INSERT statements vs. single INSERT with multiple VALUES
...hese should be minimal.
I thought I'd look into this a bit more though so set up a loop (script) and tried adjusting the number of VALUES clauses and recording the compile time.
I then divided the compile time by the number of rows to get the average compile time per clause. The results are below
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ASP.NET Identity's default Password Hasher - How does it work and is it secure?
... return 0 == xor;
}
In in your custom ApplicationUserManager, you set the PasswordHasher property the name of the class which contains the above code.
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How to start jenkins on different port rather than 8080 using command prompt in Windows?
...but after a reboot it reverted to 8080 again, is there a way to change the setting permanently?
– null
Feb 15 '14 at 13:24
1
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How do I recover/resynchronise after someone pushes a rebase or a reset to a published branch?
...rebase --onto origin/foo old-foo foo
git branch -D old-foo
Ie. first you set up a bookmark for where the remote branch originally was, then you use that to replay your local commits from that point onward onto rebased remote branch.
Rebasing is like violence: if it doesn’t solve your problem, y...
Efficient way to insert a number into a sorted array of numbers?
...Method:
~54 milliseconds
Second Method:
~57 seconds
So, at least on this setup, the native method doesn't make up for it. This is true even for small data sets, inserting 100 elements into an array of 1000:
First Method:
1 milliseconds
Second Method:
34 milliseconds
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Core dumped, but core file is not in the current directory?
...e "Segmentation fault (core dumped)".
Ultimately PEBKAC for forgetting to set ulimit, but the misleading message had me thinking I was going mad for a while, wondering what was eating my corefiles.
(Also, in general, the core(5) manual page -- man 5 core -- is a good reference for where your core ...