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When to use NSInteger vs. int
...lve this case by using the type NSInteger which serves as an int or a long based on the compile/runtime environemnt.
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如果携程决心战略性亏损到底，去哪儿怕是只剩一条路可走 - 资讯 - 清泛网 -...
...束在线旅游的价格战，回到市场的良性发展状态。
（图片来源于：易观智库）
若携程与去哪儿合并，二者将占据在线旅游市场58.5%的市场份额，远远高于行业第三名的阿里去啊
合并可霸占大交通62.8%的市场份额，酒店76.3%...
Hexadecimal To Decimal in Shell Script
... external program:
With bash:
$ echo $((16#FF))
255
with bc:
$ echo "ibase=16; FF" | bc
255
with perl:
$ perl -le 'print hex("FF");'
255
with printf :
$ printf "%d\n" 0xFF
255
with python:
$ python -c 'print(int("FF", 16))'
255
with ruby:
$ ruby -e 'p "FF".to_i(16)'
255
with node....
How to printf uint64_t? Fails with: “spurious trailing ‘%’ in format”
...0;
fmt::print("test uint64_t : {}\n", ui64);
}
The formatting facility based on this library is proposed for standardization in C++20: P0645.
Disclaimer: I'm the author of {fmt}.
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Convert pem key to ssh-rsa format
...eBuffer(&pEncoding[11 + index], nLen, nBytes);
b64 = BIO_new(BIO_f_base64());
BIO_set_flags(b64, BIO_FLAGS_BASE64_NO_NL);
bio = BIO_new_fp(stdout, BIO_NOCLOSE);
BIO_printf(bio, "ssh-rsa ");
bio = BIO_push(b64, bio);
BIO_write(bio, pEncoding, encodingLength);
BIO_flush(bio);...
How to print the ld(linker) search path
...ber of different built-in default linker scripts, and chooses between them based on various other linker options.)
If you're linking via gcc:
You can pass the -v option to gcc so that it shows you how it invokes the linker. In fact, it normally does not invoke ld directly, but indirectly via a ...
从源代码剖析Mahout推荐引擎 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
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以UserCF的推荐算法为例，官方建议我们的开发过程：
图片摘自Mahout in Action
从上图中我们可以看到，算法是被模块化的，通过1,2,3,4的过程进行方法调用。
程序代码：
public class UserCF {
final static int NEIGHBORHOOD_NUM = 2;
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Where do “pure virtual function call” crashes come from?
...bject hasn't been constructed or has already been destroyed), it calls the base class version, which in the case of a pure virtual function, doesn't exist.
(See live demo here)
class Base
{
public:
Base() { doIt(); } // DON'T DO THIS
virtual void doIt() = 0;
};
void Base::doIt()
{
s...
Fatal error: “No Target Architecture” in Visual Studio
...
windows.h defines alkinds of other defines based on compiler-switches and includes many WINAPI-headers ,some of which depending on things defned by windows.h.
– engf-010
Jan 30 '11 at 22:26
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How to change int into int64?
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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