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How to check if std::map contains a key without doing insert?
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Use my_map.count( key ); it can only return 0 or 1, which is essentially the Boolean result you want.
Alternately my_map.find( key ) != my_map.end() works too.
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Why doesn't Haskell's Prelude.read return a Maybe?
...ybe s = case reads s of
[(x, "")] -> Just x
_ -> Nothing
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python's re: return True if string contains regex pattern
...ch is a more efficient way to do this, should I use python's 'xyz' in given_text or use re.compile(r'xyz').search(given_text) ?
– bawejakunal
May 4 '16 at 9:01
1
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How are people managing authentication in Go? [closed]
...-nuts mailing list:
https://groups.google.com/forum/#!msg/golang-nuts/GE7a_5C5kbA/fdSnH41pOPYJ
This provides a suggested schema and server-side implementation as a basis for custom authentication. The client-side code is still up to you.
(I hope the author of the post sees this: Thanks!)
Excerpt...
How to view the Folder and Files in GAC?
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Install:
gacutil -i "path_to_the_assembly"
View:
Open in Windows Explorer folder
.NET 1.0 - NET 3.5: c:\windows\assembly (%systemroot%\assembly)
.NET 4.x: %windir%\Microsoft.NET\assembly
OR gacutil –l
When you are going to install an as...
Understanding ibeacon distancing
...curacy. Following URLs to start with: http://en.wikipedia.org/wiki/Standard_error, http://en.wikipedia.org/wiki/Uncertainty
In physical world, when you make some measurement, you always get different results (because of noise, distortion, etc) and very often results form Gaussian distribution. Ther...
How to write a Unit Test?
...can do your assertions like below:
Assertions.assertTrue(f.flipEquiv(node1_1, node2_1));
These are the imports that I added:
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;
This is the test that I wrote:
You can check your methods like below:
Assertions.assertE...
How to customize a Spinner in Android
...ter.createFromResource(this,
R.array.travelreasons, R.layout.simple_spinner_item);
adapter.setDropDownViewResource(R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
R.layout.simple_spinner_item
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
...
How to unset a JavaScript variable?
...ed.
(1) If it is created with var, it cannot be deleted.
For example:
var g_a = 1; //create with var, g_a is a variable
delete g_a; //return false
console.log(g_a); //g_a is still 1
(2) If it is created without var, it can be deleted.
g_b = 1; //create without var, g_b is a property
delete g_b; /...
C++ error: undefined reference to 'clock_gettime' and 'clock_settime'
...c version 2.17, the library linking -lrt is no longer required.
The clock_* are now part of the main C library. You can see the change history of glibc 2.17 where this change was done explains the reason for this change:
+* The `clock_*' suite of functions (declared in <time.h>) is now avai...