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When should you use 'friend' in C++?
...
friend class Mother;
public:
string name( void );
protected:
void setName( string newName );
};
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How to send email attachments?
...', "octet-stream")
with open(path, 'rb') as file:
part.set_payload(file.read())
encoders.encode_base64(part)
part.add_header('Content-Disposition',
'attachment; filename="{}"'.format(Path(path).name))
msg.attach(part)
smtp = sm...
MongoDB logging all queries
...st
> use myDb
switched to db myDb
> db.getProfilingLevel()
0
> db.setProfilingLevel(2)
{ "was" : 0, "slowms" : 1, "ok" : 1 }
> db.getProfilingLevel()
2
> db.system.profile.find().pretty()
Source: http://docs.mongodb.org/manual/reference/method/db.setProfilingLevel/
db.setProfilingL...
Excel to CSV with UTF8 encoding [closed]
...are Developer Absolutely, Positively Must Know About Unicode and Character Sets?
– Indolering
May 23 '13 at 5:56
...
Reorder levels of a factor without changing order of values
... I have a very strange situation where the ´reorder´ works on one dataset, not on another. On the other dataset, it throws an error "Error in tapply(X = X, INDEX = x, FUN = FUN, ...) : argument "X" is missing, with no default". Not sure what the solution to this problem is. I can't find any rel...
What does functools.wraps do?
...ribute__(name)
return self.func.__getattribute__(name)
def __setattr__(self, name, value):
if name == "func":
return super(DecBase, self).__setattr__(name, value)
return self.func.__setattr__(name, value)
This class proxies all the attribute calls over to...
SVN needs-lock 设置强制只读属性（官方资料） - 环境配置 - 清泛IT论坛，...
...ioning of binary files should follow the lock-modify-unlock model[1]. This setup uses the following three measuresforces users to use property svn:needs-lock on newly added binary files. Denies commits when the property is not available
sets the svn:needs-lock property on all already existing bi...
Which MySQL data type to use for storing boolean values
...iate because it uses zero data bytes:
some_flag CHAR(0) DEFAULT NULL
To set it to true, set some_flag = '' and to set it to false, set some_flag = NULL.
Then to test for true, check if some_flag IS NOT NULL, and to test for false, check if some_flag IS NULL.
(This method is described in "High P...
How can I get this ASP.NET MVC SelectList to work?
...roblem is, SelectList works as designed. The bug is in the design.
You may set the Selected Property in SelectedItem, but this will completely be ignored,
if you traverse the list with the GetEnumerator() (or if Mvc does that for you). Mvc will create new SelectListItems instead.
You have to use t...
How to use a variable to specify column name in ggplot
...able/column from the rates.by.groups data frame.
library(ggplot2)
theme_set(theme_classic(base_size = 14))
# created by @Moody_Mudskipper
rates.by.groups <- data.frame(
name = LETTERS[1:3],
rate = 1:3,
mjr = LETTERS[c(4, 4, 5)],
gender = c("M", "F", "F")
)
f1 <- function(df, colum...