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Is it better to use std::memcpy() or std::copy() in terms to performance?
... of std::copy over memcpy: 2.99%
My compiler is gcc 4.6.3 on Fedora 16 x86_64. My optimization flags are -Ofast -march=native -funsafe-loop-optimizations.
Code for my SHA-2 implementations.
I decided to run a test on my MD5 implementation as well. The results were much less stable, so I decided t...
libunwind链接时报错：undefined reference to `_Ux86_64_init_local\' - ...
libunwind链接时报错：undefined reference to `_Ux86_64_init_local'编译安装libunwind后，代码编译链接时报错：undefined reference to `_Ux86_64_init_local& 39;，链接选项加了 -lunwind，仍然报错。原因：编译出来的libunwind拆分成了很多个 编译安装libunwi...
RE error: illegal byte sequence on Mac OS X
...
However, the same effect can be had ad-hoc for a single command only:
LC_ALL=C sed -i "" 's|"iphoneos-cross","llvm-gcc:-O3|"iphoneos-cross","clang:-Os|g' Configure
Note: What matters is an effective LC_CTYPE setting of C, so LC_CTYPE=C sed ... would normally also work, but if LC_ALL happens to ...
Default height for section header in UITableView
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From checking the defaults in my app it looks like for a grouped table the default is a height of 22 and for a non-grouped table the default is a height of 10.
If you check the value of the property sectionHeaderHeight on your tableview that should tell yo...
How can I match a string with a regex in Bash?
...n the comment above, We need to store the regex on a var
The variable BASH_REMATCH is set after you match the expression, and ${BASH_REMATCH[n]} will match the nth group wrapped in parentheses ie in the following ${BASH_REMATCH[1]} = "compressed" and ${BASH_REMATCH[2]} = ".gz"
if [[ "compressed.gz...
How to post data to specific URL using WebClient in C#
... allow same key .thus may lead weird begaiviour
– bh_earth0
Jan 17 '17 at 21:49
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What does “dereferencing” a pointer mean?
...hat can be written to, then you can do things like this:
int x = 2;
int* p_x = &x; // Put the address of the x variable into the pointer p_x
*p_x = 4; // Change the memory at the address in p_x to be 4
assert(x == 4); // Check x is now 4
Above, you must have known at compile time that ...
ASP.NET Bundles how to disable minification
... would still have to have EnableOptimizations set to true for bundling to happen.
– Hao Kung
Sep 12 '12 at 4:40
2
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Illegal pattern character 'T' when parsing a date string to java.util.Date
...Zone UTC;
/**
* @see <a href="http://en.wikipedia.org/wiki/ISO_8601#Combined_date_and_time_representations">Combined Date and Time Representations</a>
*/
public static final String ISO_8601_24H_FULL_FORMAT = "yyyy-MM-dd'T'HH:mm:ss.SSSXXX";
/**
* 0001-01-01T00...
How to export table as CSV with headings on Postgresql?
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COPY products_273 TO '/tmp/products_199.csv' WITH (FORMAT CSV, HEADER);
as described in the manual.
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