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The static keyword and its various uses in C++
... do different things. For instance, you could put a static void log(const char*) {} in each cpp file, and they could each all log in a different way.
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How to find Unused Amazon EC2 Security groups
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If you select all of your security groups in the EC2 console, then press actions -> Delete Security Groups, a popup will appear telling you that you cannot delete security groups that are attached to instances, other security gro...
How to change the name of a Django app?
...ete the permissions: delete from auth_permission where content_type_id in (select id from django_content_type where app_label = '<OldAppName>')
Delete content types: delete from django_content_type where app_label = '<OldAppName>'
Rename the folder of the app.
Change any references to y...
What characters are forbidden in Windows and Linux directory names?
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A “comprehensive guide” of forbidden filename characters is not going to work on Windows because it reserves filenames as well as characters. Yes, characters like
* " ? and others are forbidden, but there are a infinite number of names composed only of valid characters t...
Which, if any, C++ compilers do tail-recursion optimization?
...t for program correctness.
#include <stdio.h>
static int atoi(const char *str, int n)
{
if (str == 0 || *str == 0)
return n;
return atoi(str+1, n*10 + *str-'0');
}
int main(int argc, char **argv)
{
for (int i = 1; i != argc; ++i)
printf("%s -> %d\n", argv[i], at...
How to delete a row by reference in data.table?
...el.idxs' vs. 'keep.idxs'
keep.idxs <- setdiff(DT[, .I], del.idxs); # select row indexes to keep
cols = names(DT);
DT.subset <- data.table(DT[[1]][keep.idxs]); # this is the subsetted table
setnames(DT.subset, cols[1]);
for (col in cols[2:length(cols)]) {
DT.subset[, (col) := DT[...
Explode PHP string by new line
... answered Oct 22 '10 at 13:42
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How should I use try-with-resources with JDBC?
...e method:
public List<User> getUser(int userId) {
String sql = "SELECT id, username FROM users WHERE id = ?";
List<User> users = new ArrayList<>();
try (Connection con = DriverManager.getConnection(myConnectionURL);
PreparedStatement ps = con.prepareStatement(...
How to determine MIME type of file in android?
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If the media is selected from android gallery then TYPE is returned. If selected from File Manager then null is returned.
– Rahul Rastogi
Aug 27 '14 at 12:34
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Are the days of passing const std::string & as a parameter over?
...ring has various components including a pointer into the heap and a member char[] for short string optimization. So it seems to me that passing by reference is still a good idea. Can anyone explain why Herb might have said this?
If stack size is a concern (and assuming this is not inlined/optimize...