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初窥InnoDB的Memcached插件 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...
| c2 | varchar(1024) | YES | | NULL | |
| c3 | int(11) | YES | | NULL | |
| c4 | bigint(20) unsigned | YES | | NULL | |
| c5 | int(11) | YES | | NULL | |
+-------+---------------------+------+-----...
Defining custom attrs
...e.g, "@color/my_color", "@layout/my_layout")
color
boolean
dimension
float
integer
string
fraction
enum - normally implicitly defined
flag - normally implicitly defined
You can set the format to multiple types by using |, e.g., format="reference|color".
enum attributes can be defined as follows:
...
How do I create a random alpha-numeric string in C++?
...;
#include <unistd.h>
using namespace std;
string gen_random(const int len) {
string tmp_s;
static const char alphanum[] =
"0123456789"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz";
srand( (unsigned) time(NULL) * getpid());
...
Change Checkbox value without triggering onCheckChanged
...the solution. mListener is an implementation of the OnCheckChangedListener interface, which was created by the programmer. My answer implies that the programmer maintained a reference to their own implementation - mListener.
– Shade
Jul 9 '14 at 8:20
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Object-orientation in C
...sic level, you just use plain structs as objects and pass them around by pointers:
struct monkey
{
float age;
bool is_male;
int happiness;
};
void monkey_dance(struct monkey *monkey)
{
/* do a little dance */
}
To get things like inheritance and polymorphism, you have to work a l...
Determine if Android app is being used for the first time
...
SharedPreferences are maintained during upgrade. So, I assume that when its being upgraded from PlayStore, old value is available. In fact it is applicable for other methods i.e. checking existence of file too. So, shortcut method in that case is to...
Swift: Pass array by reference?
... when I add a chat to account.chats , chatsViewController.chats still points to account.chats ). I.e., I don't want Swift to separate the two arrays when the length of account.chats changes.
...
Why are there no ++ and -- operators in Python?
...n't needed as much as in other languages. You don't write things like for(int i = 0; i < 10; ++i) in Python very often; instead you do things like for i in range(0, 10).
Since it's not needed nearly as often, there's much less reason to give it its own special syntax; when you do need to increm...
Determining complexity for recursive functions (Big O notation)
...
The time complexity, in Big O notation, for each function:
int recursiveFun1(int n)
{
if (n <= 0)
return 1;
else
return 1 + recursiveFun1(n-1);
}
This function is being called recursively n times before reaching the base case so its O(n), often called line...
Use of exit() function
...
Try using exit(0); instead. The exit function expects an integer parameter. And don't forget to #include <stdlib.h>.
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