大约有 4,761 项符合查询结果（耗时：0.0170秒） [XML]
Declare a block method parameter without using a typedef
Is it possible to specify a method block parameter in Objective-C without using a typedef? It must be, like function pointers, but I can't hit on the winning syntax without using an intermediate typedef:
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How to expand a list to function arguments in Python [duplicate]
Is there syntax that allows you to expand a list into the arguments of a function call?
4 Answers
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What does the 'u' symbol mean in front of string values? [duplicate]
Yes in short i would like to know why am I seeing a u in front of my keys and values.
2 Answers
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How to create empty data frame with column names specified in R? [duplicate]
I need to create an empty data frame in R with specified column names. Any simplest way ?
2 Answers
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Transitivity of Auto-Specialization in GHC
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Short answers:
The question's key points, as I understand them, are the following:
"is the auto-specialization transitive?"
Should I only expect (+) to be specialized transitively with an explicit pragma?
(apparently intended) Is this a bug of G...
Techniques for Tracing Constraints
Here's the scenario: I've written some code with a type signature and GHC complains could not deduce x ~ y for some x and y . You can usually throw GHC a bone and simply add the isomorphism to the function constraints, but this is a bad idea for several reasons:
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Linux Shell中 if else及大于、小于、等于逻辑表达式写法 - C/C++ - 清泛网...
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1、判断文件是否存在
#!/bin/sh
# 判断文件是否存在
YACCESS=`date -d yesterday +%Y%m%d`
FILE="access_$YACCESS.log.tgz"
cd /data/nginx/logs
if [ -f "$FILE" ];then
echo "OK"
else
echo "error $FILE" > error.log
mail -s "$FILE backup fail" test@tsingfun.com <error.log
fi
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VS工程“生成事件”之文件拷贝 - C/C++ - 清泛网 - 专注C/C++及内核技术
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拷单文件至Debug/Release目录（支持*通配符）：
copy "$(ProjectDir)lib\P*APID.dll" "$(SolutionDir)$(ConfigurationName)\"
拷文件夹：
xcopy /D /Y /E "$(ProjectDir)conf" "$(SolutionDir)$(ConfigurationName)\conf\"
（/D 只复制时间戳最新的文件，/Y 不提示...
/usr/include/c++/4.9/bits/stl_iterator_base_types.h:165:53: error: ‘i...
/usr/include/c++/4.9/bits/stl_iterator_base_types.h:165:53: error: ‘int’ is not a class, struct, or union type先看下面的代码(来自:SO)：#include <iostream>#include <cmath>#include <vector>using namespace std;double distance(int a, in...先看下面的代码(来自: SO)：
#include <i...
math.h 函数说明一览 - C/C++ - 清泛网 - 专注C/C++及内核技术
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log10()
返回以10为底的对数值
pow()
求x的y次方（次幂）
sin()
正弦函数
sinh()
双曲正玄函数
sqrt()
求给定值的平方根
tan()
正切函数
tanh()
双曲线正切函数
fabs()
求浮点数...