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Why are ToLookup and GroupBy different?
...cally they are the same thing but the performance implications of each are completely different. Calling ToLookup means I want a cache of the entire thing right now organized by group. Calling GroupBy means "I am building an object to represent the question 'what would these things look like if I o...
Does Notepad++ show all hidden characters?
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Menu View → Show Symbol → Show White Space and TAB
(Thanks to bers' comment and bkaid's answers below for these updated locations.)
On older versions you can look for:
Menu View → Show all characters
or
Menu View → Show White Space and TAB
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How to get a index value from foreach loop in jstl
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I need to know the index[location] of each element comes in the String Array.
– Java Questions
Sep 16 '13 at 11:10
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C# Convert List to Dictionary
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var res = list.Distinct().ToDictionary(x => x, x => x);
EDIT To comment on the valid reason, I think the only reason that could be valid for conversions like this is that at some point the keys and the values in the resultant dictionary are going to diverge. For example, you would do an i...
How do I join two SQLite tables in my Android application?
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How to prevent gcc optimizing some statements in C?
... but it is unnecessary. A safer alternative is to make it illegal for the compiler to optimize out the store by using the volatile type qualifier.
// Assuming pageptr is unsigned char * already...
unsigned char *pageptr = ...;
((unsigned char volatile *)pageptr)[0] = pageptr[0];
The volatile typ...
What does -D_XOPEN_SOURCE do/mean?
I recently encountered some code that gcc would not compile without this arg. I checked the gcc man page, but did not find this specific option. I did find XOPEN_SOURCE , but there was little explanation of what it does.
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In PHP what does it mean by a function being binary-safe?
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C# - Multiple generic types in one list
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+10 for this! I don't know why this compiles.. Exactly what I needed!
– Odys
Dec 20 '11 at 22:45
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