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Constant pointer vs Pointer to constant [duplicate]
...elf but the object pointed to by ptr shall not be modified.
const int a = 10;
const int* ptr = &a;
*ptr = 5; // wrong
ptr++; // right
While
int * const ptr;
declares ptr a const pointer to int type. You are not allowed to modify ptr but the object pointed to by ptr can be modified.
in...
【解决】bufferevent_openssl.c:228:19: error: storage size of \'methods...
...revent_openssl.lo' failed
原因：
系统openssl的安装版本是1.1.0+，而xunsearch安装包里的libevent 2.0.x需要openssl < 1.1.0，导致不兼容报错。
常用的几个Linux发行版已经把系统的openssl升级到了1.1.0+，即对应需要libevent 2.1.x+，而libevent 2.1.x...
Measure the time it takes to execute a t-sql query
I have two t-sql queries using SqlServer 2005. How can I measure how long it takes for each one to run?
6 Answers
...
Print a string as hex bytes?
...: Hello world !! and I want to print it using Python as 48:65:6c:6c:6f:20:77:6f:72:6c:64:20:21:21 .
13 Answers
...
Approximate cost to access various caches and main memory?
...ycles etc. The second link served the following numbers:
Core i7 Xeon 5500 Series Data Source Latency (approximate) [Pg. 22]
local L1 CACHE hit, ~4 cycles ( 2.1 - 1.2 ns )
local L2 CACHE hit, ~10 cycles ( 5.3 - 3.0 ns...
How to save an image to localStorage and display it on the next page?
...img.height;
var ctx = canvas.getContext("2d");
ctx.drawImage(img, 0, 0);
var dataURL = canvas.toDataURL("image/png");
return dataURL.replace(/^data:image\/(png|jpg);base64,/, "");
}
Then, on my next page I created an image with a blank src like so:
<img src="" id="tableBanne...
`static` keyword inside function?
...
rphv
4,60533 gold badges2626 silver badges4343 bronze badges
answered May 31 '11 at 14:22
YoshiYoshi
...
nodejs get file name from absolute path?
... |
edited Mar 11 '19 at 7:06
answered Nov 6 '13 at 11:59
Vi...
How to compare two dates in php
How to compare two dates in php if dates are in format '03_01_12' and '31_12_11' .
15 Answers
...
How to print a groupby object
...
101
Simply do:
grouped_df = df.groupby('A')
for key, item in grouped_df:
print(grouped_df.get...