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Creating C macro with ## and __LINE__ (token concatenation with positioning macro)
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The problem is that when you have a macro replacement, the preprocessor will only expand the macros recursively if neither the stringizing operator # nor the token-pasting operator ## are applied to it. So, you have to use some extra layers of indirection, you can use the token-pasting operat...
Why can I change value of a constant in javascript
...now that ES6 is not standardized yet, but a lot of browsers currently support const keyword in JS.
7 Answers
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How to prevent column break within an element?
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The correct way to do this is with the break-inside CSS property:
.x li {
break-inside: avoid-column;
}
Unfortunately, as of October 2019, this is not supported in Firefox but it is supported by every other major browser. W...
Turn on IncludeExceptionDetailInFaults (either from ServiceBehaviorAttribute or from the
I have a WCF service that has been working perfectly, and something has changed and I don't know what.
6 Answers
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Fill between two vertical lines in matplotlib
.... The differences is that axvspan (and axhspan) will fill up the entire y (or x) extent of the plot regardless of how you zoom.
For example, let's use axvspan to highlight the x-region between 8 and 14:
import matplotlib.pyplot as plt
fig, ax = plt.subplots()
ax.plot(range(20))
ax.axvspan(8, 14, ...
android TextView: setting the background color dynamically doesn't work
Setting the background color programatically of an android TextView doesn't seem to work.
I'm I missing something!
14 Ans...
What are the differences between struct and class in C++?
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You forget the tricky 2nd difference between classes and structs.
Quoth the standard (§11.2.2 in C++98 through C++11):
In absence of an access-specifier
for a base class, public is assumed
when the derived class is decla...
Is object empty? [duplicate]
What is the fastest way to check if an object is empty or not?
23 Answers
23
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Why does this (null || !TryParse) conditional result in “use of unassigned local variable”?
...as Quartermeister demonstrates; dynamic might implement a weird true operator which might cause y to never be initialized.
Here's a minimal repro:
class Program
{
static bool M(out int x)
{
x = 123;
return true;
}
static int N(dynamic d)
{
int y;
...
How do I change permissions for a folder and all of its subfolders and files in one step in Linux?
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The other answers are correct, in that chmod -R 755 will set these permissions to all files and subfolders in the tree. But why on earth would you want to? It might make sense for the directories, but why set the execute bit on all the files?
I s...