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How many GCC optimization levels are there?
...rfere with debugging. It should be the
optimization level of choice for the standard edit-compile-debug cycle, offering a reasonable level of optimization
while maintaining fast compilation and a good debugging experience.)
-Os (Optimize for size. -Os enables all -O2 optimizations that...
6个变态的C语言Hello World程序 - 创意 - 清泛网 - 专注C/C++及内核技术
... >>1))),(((1<<1)<<(1<<1))+((1<<1)<< (1<<(
1>>1))) + (1<< (1>>1)))}; for(i=(1>>1);i
<(((1<<1) <<(1<<1))+((1 <<1)<< (1<<(1>>1
))) + (1<<1)); i++) printf("%c",n[i]); }
hello6.cpp
下面的程序只能由C++的编译器编译（比如：g++）
#include <stdio.h>
#define _(_) putch...
Regular Expression for alphanumeric and underscores
...those characters (or an empty string), try
"^[a-zA-Z0-9_]*$"
This works for .NET regular expressions, and probably a lot of other languages as well.
Breaking it down:
^ : start of string
[ : beginning of character group
a-z : any lowercase letter
A-Z : any uppercase letter
0-9 : any digit
_ : u...
Correct use of Multimapping in Dapper
...big caveat here, if the column ordering in the underlying table is flipped for some reason:
ProductID | ProductName | AccountOpened | CustomerName | CustomerId
--------------------------------------- -------------------------
splitOn: CustomerId will result in a null customer name.
If yo...
[精华] VC中BSTR、Char和CString类型的转换 - C/C++ - 清泛网 - 专注C/C++及内核技术
...若将char*转换成CString，除了直接赋值外，还可使用CString::format进行。例如：
char chArray[] = "This is a test";
char * p = "This is a test";
或
LPSTR p = "This is a test";
或在已定义Unicode应的用程序中
TCHAR * p = _T("This is a test");
或
LPTSTR ...
split string only on first instance of specified character
...st _ is matched inside a capturing group, and gets added to the token list for that reason.
– Alan Moore
Jan 5 '11 at 20:04
28
...
Does MongoDB's $in clause guarantee order
...sults
{ "$sort": { "weight": 1 } }
])
So that would be the expanded form. What basically happens here is that just as the array of values is passed to $in you also construct a "nested" $cond statement to test the values and assign an appropriate weight. As that "weight" value reflects the ord...
STL：accumulate与自定义数据类型 - C/C++ - 清泛网 - 专注C/C++及内核技术
...utIterator>)
__glibcxx_requires_valid_range(__first, __last);
for ( ; __first != __last; ++__first)
__init = __binary_op(__init, *__first);
return __init;
}
第四个参数为 __binary_op ,我们需要重写这个函数对象，后面还会继续分析...
假设自定...
When are C++ macros beneficial? [closed]
...
As wrappers for debug functions, to automatically pass things like __FILE__, __LINE__, etc:
#ifdef ( DEBUG )
#define M_DebugLog( msg ) std::cout << __FILE__ << ":" << __LINE__ << ": " << msg
#else
#define ...
Method Resolution Order (MRO) in new-style classes?
...
The crucial difference between resolution order for legacy vs new-style classes comes when the same ancestor class occurs more than once in the "naive", depth-first approach -- e.g., consider a "diamond inheritance" case:
>>> class A: x = 'a'
...
>>> cl...