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How to concatenate twice with the C preprocessor and expand a macro as in “arg ## _ ## MACRO”?
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edited May 23 '17 at 11:47
Community♦
111 silver badge
answered Sep 29 '09 at 0:23
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Is gcc std::unordered_map implementation slow? If so - why?
...d_map:
inserts: 7289
get: 1908
Using std::map:
inserts: 19222
get: 19711
I have not tested the code using GCC but I think it may be comparable to the performance of VC, so if that is true, then GCC 4.9 std::unordered_map it's still broken.
[EDIT]
So yes, as someone said in the comments, the...
Random String Generator Returning Same String [duplicate]
...dstad Agreed, I did a loop and it hits a collision after approximately 130,000 iterations. Even though there are 1,785,793,904,896 combinations.
– Andrew
Jan 24 '12 at 12:54
18
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Migration: Cannot add foreign key constraint
...Blueprint $table) {
// this line throw QueryException "SQLSTATE[HY000]: General error: 1215 Cannot add foreign key constraint..."
// $table->integer('user_id')->unsigned()->index();
$table->bigInteger('user_id')->unsigned()->index(); // this is working
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TortoiseSVN icons not showing up under Windows 7
...drive icons start with a space(!): " Skydrive1", Box.com icons start with "000", Avast! names its overlay "00Avast", etc.
– Chris R. Donnelly
Jun 6 '13 at 14:48
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(this == null) in C#!
...d]
private static string <.ctor>b__0()
{
string CS$1$0000;
CS$1$0000 = CS$1$0000.CheckNull();
Label_0009:
return CS$1$0000;
}
private string CheckNull()
{
string CS$1$0000;
CS$1$0000 = "Am I null? " + ((bool) (this == null));
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Change the color of a bullet in a html list?
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<ul>
<li style="color: #888;"><span style="color: #000">test</span></li>
</ul>
the big problem with this method is the extra markup. (the span tag)
share
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Why are these constructs using pre and post-increment undefined behavior?
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DaveRandom
82.3k1111 gold badges140140 silver badges167167 bronze badges
answered Jun 4 '09 at 9:20
unwindunwind
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How to get all possible combinations of a list’s elements?
... you pick all elements corresponding to a "1".
items=abc * mask=###
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V
000 ->
001 -> c
010 -> b
011 -> bc
100 -> a
101 -> a c
110 -> ab
111 -> abc
Things to consider:
This requires that you can call len(...) on items (workaround: if items is something like an ite...
Java Date vs Calendar
... Yes. But there are thousands of people reading this page now, over 150,000 so far. My comment is a note to them, not a criticism of you.
– Basil Bourque
Oct 19 '18 at 22:54
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