大约有 40,000 项符合查询结果（耗时：0.0344秒） [XML]
Where can I learn how to write C code to speed up slow R functions? [closed]
...simpler code, less boilerplate, no PROTECT/UNPROTECT, no memory management etc pp. Doug Bates just yesterday stated that he finds C++ and Rcpp to be much more like writing R than writing C++. YMMV and all that.
share
...
How can I add reflection to a C++ application?
...trospect a C++ class for its name, contents (i.e. members and their types) etc. I'm talking native C++ here, not managed C++, which has reflection. I realise C++ supplies some limited information using RTTI. Which additional libraries (or other techniques) could supply this information?
...
How to make MySQL handle UTF-8 properly
...
It didn't work in my case but I created file my.cf in /etc with given content anyway. I used create table my_name(field_name varchar(25) character set utf8);
– Marek Bar
Jul 9 '12 at 11:43
...
Add a new column to existing table in a migration
...s
All of the commands for making things (controllers, models, migrations etc) have been moved under the make: command.
php artisan migrate is still the same though.
share
|
improve this answer
...
Rails raw SQL example
...s.rubyonrails.org/active_record_querying.html
and in associations, scopes, etc. You could probably construct the same SQL with ActiveRecord relational queries and can do cool things with ARel as Ernie mentions in http://erniemiller.org/2010/03/28/advanced-activerecord-3-queries-with-arel/. And, of c...
Why does Python code use len() function instead of a length method?
...
len, str, etc. can be used with higher-order functions like map, reduce, and filter without the need to define a function or lambda just to call a method. Not everything revolves around OOP, even in Python.
– Evic...
What new capabilities do user-defined literals add to C++?
...eate our own types (i.e. classes), with potentially no overhead (inlining, etc.). We had the possibility to add operators to their types, to have them behave like similar built-in types, which enables C++ developers to use matrices and complex numbers as naturally as they would have if these have be...
shared_ptr指针被赋值后，原指针会引用清零、自动释放。 - C/C++ - 清泛网 ...
...::shared_ptr<int> p)
{
intg = p; // 原指针释放，存储新的智能指针
//*(intg.get()) = *(p.get()); // 原指针不释放，仅修改原指针指向的内容
}
int _tmain(int argc, _TCHAR* argv[])
{
{
std::shared_ptr<int> sp(new int(2)...
std::vector find查找方法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...= vecTest.end();
注意：.begin()，.end()一定不要忘记了后面的括号，否则报如下错误：
error C3867: “std::vector<_Ty>::end”: 函数调用缺少参数列表；请使用“&std::vector<_Ty>::end”创建指向成员的指针vector find
VC IP地址控件（CIPAddressCtrl ）的自绘 - C/C++ - 清泛网 - 专注C/C++及内核技术
VC IP地址控件（CIPAddressCtrl ）的自绘先看效果图：代码：.h#pragma once class CMyIPCtrl : public CIPAddressCtrl{DECLARE_DYNAMIC(CMyIPCtrl)public:CMyIPCtrl();virtua...先看效果图：
代码：
.h
#pragma once
class CMyIPCtrl : public CIPAddressCtrl
{
DECLARE_DYNAMI...