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memcpy() 是非线程安全的，并发时需加锁或使用原子操作 - C/C++ - 清泛网 -...
...子操作memcpy_thread_unsafe最近调查线上一个问题，就是一块 int32 的内存会极低概率出现 -18亿的巨数字，有时又是正确的。自己刻意测试又不能再现，在确认不可能将这样一个巨量数字写入的情况下，这时只 最近调查线上一个问...
BrightnessTools 拓展：设置手机亮度的工具 - App Inventor 2 拓展 - 清泛I...
...ged" indicate what has change.
ParamsTypeDescriptionchangedNumber (int)Return what has been changed.
0 = Brightness Change,
1 = Adaptive ChangebrightnessNumber (int)Return current brightnessadaptivebooleanReturn current adaptive state
Returns: Boolean
Check if modify system setting per...
BrightnessTools 拓展：设置手机亮度的工具 · App Inventor 2 中文网
...
changed
Number (int)
返回哪些发生了变化。
0 = 亮度变化，
1 = 自适应变化
...
What datatype to use when storing latitude and longitude data in SQL databases? [duplicate]
...itudes go from -90 to 90 degrees...so only need 2 places left of decimal point...
– dotjoe
Apr 10 '15 at 19:21
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show 7 more comments
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When should I use the HashSet type?
... contradicts what you say about order not being a property of a set - or points out to a misunderstanding from the development team.
– Veverke
Aug 3 '16 at 16:07
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Java: using switch statement with enum under subclass
... the case statement so it can only be one enum.
– sprinter
Dec 23 '15 at 1:49
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show 4 more comments
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How to get the current directory in a C program?
...ing at opendir() and telldir() , but telldir() returns a off_t (long int) , so it really doesn't help me.
6 Answers
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How can I catch a ctrl-c event?
....h>
#include <stdio.h>
#include <unistd.h>
void my_handler(int s){
printf("Caught signal %d\n",s);
exit(1);
}
int main(int argc,char** argv)
{
struct sigaction sigIntHandler;
sigIntHandler.sa_handler = my_handler;
sigemptyset(&sigIntHandler.sa_...
How to perform Callbacks in Objective-C
.... Here's an example of a custom delegate implementation;
Header File:
@interface MyClass : NSObject {
id delegate;
}
- (void)setDelegate:(id)delegate;
- (void)doSomething;
@end
@interface NSObject(MyDelegateMethods)
- (void)myClassWillDoSomething:(MyClass *)myClass;
- (void)myClassDidDoSome...
Unique combination of all elements from two (or more) vectors
...s better than the classic expand.grid function because (1) strings are not converted into factors and (2) the sorting is more intuitive:
library(tidyr)
a <- c("ABC", "DEF", "GHI")
b <- c("2012-05-01", "2012-05-02", "2012-05-03", "2012-05-04", "2012-05-05")
crossing(a, b)
# A tibble: 15 x 2...