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Recursive lambda functions in C++11
...0);
}
Trick here is that lambdas can access static variables and you can convert stateless ones to function pointer.
You can use it with standard lambdas:
void g()
{
int sum;
auto rec = [&sum](int i) -> int
{
static int (*inner)(int&, int) = [](int& _sum, int i...
Force add despite the .gitignore file
...me slash "/" works but backslash "\" doesn't. The fact that cmd/PowerShell convert "/" to "\" for us makes it easy to run into this.
– ohw
Oct 18 '15 at 22:47
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...
How to find the length of a string in R
...
nchar(YOURSTRING)
you may need to convert to a character vector first;
nchar(as.character(YOURSTRING))
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Subset of rows containing NA (missing) values in a chosen column of a data frame
...r "NA" and "NULL" cells may be of various type (the default behavior is to convert "NA" strings to NA values, and let "NULL" strings as is).
If using read.table() or read.csv(), you should consider the "na.strings" argument to do clean data import, and always work with real R NA values.
An example...
Find the files existing in one directory but not in the other [closed]
...that does exactly what I wanted: Verify a bulk copy: +1 from me. (neeed to convert to python2 though) Hint: use of sets might make the diff part simpler.
– Jason Morgan
Difference between a user and a schema in Oracle?
...cription VARCHAR2(50),
CONSTRAINT test_tab_pk PRIMARY KEY (id)
);
GRANT SELECT ON test_tab TO schema_ro_role;
GRANT SELECT, INSERT, UPDATE, DELETE ON test_tab TO schema_rw_role;
Notice how the privileges are granted to the relevant roles. Without
this, the objects would not be visible to ...
TypeError: got multiple values for argument
...r example, let's imagine a function that draws a colored box. The function selects the color to be used and delegates the drawing of the box to another function, relaying all extra arguments.
def color_box(color, *args, **kwargs):
painter.select_color(color)
painter.draw_box(*args, **kwargs...
Get nested JSON object with GSON using retrofit
...= new Retrofit.Builder()
.baseUrl(url)
.addConverterFactory(GsonConverterFactory.create(gson))
.build();
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How do I return rows with a specific value first?
...to treat boolean expressions as having a numeric value, then you can use:
SELECT *
FROM `Users`
ORDER BY (`city` = 'New York') DESC, `city`
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fo...
“Width equals height” constraint in Interface Builder
...click and drag from a view and release while the pointer is over the view. Select "Aspect Ratio". It will create a constraint where the first and second item is the view.
Before Xcode 5.1
You can't because the width/height editor lacks the fields to relate to another property or set the ratio:
...