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print call stack in C or C++
...mpilation fails.
Output:
0# boost::stacktrace::basic_stacktrace<std::allocator<boost::stacktrace::frame> >::basic_stacktrace() at /usr/include/boost/stacktrace/stacktrace.hpp:129
1# my_func_1(int) at /home/ciro/test/boost_stacktrace.cpp:18
2# main at /home/ciro/test/boost_stacktrace...
An efficient way to transpose a file in Bash
... rs -c' ' -C' ' -T < rows.seq > cols.seq gives rs: no memory: Cannot allocate memory. This is a system running FreeBSD 11.0-RELEASE with 32 GB of ram. So, my guess is that rs puts everything in RAM, which is good for speed, but not for large data.
– jrm
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Is there a MySQL command to convert a string to lowercase?
...case. Is there an easy command to do this, either using MySQL or MySQL and PHP?
9 Answers
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How to set default values in Rails?
... method. That blog post's discussion about ActiveRecord directly calling .allocate was about model objects loaded with existing data from the database. (And it's a terrible idea for ActiveRecord to work that way, IMO. But that's beside the point.)
– SFEley
M...
Javascript foreach loop on associative array object
...ceving, can you explain more on why not use var in loops? I come from C++/PHP background and I don't understand this. scoping does exist in the loop, but temporary, so I am not sure what you mean.
– Dennis
Jul 21 '16 at 21:33
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jQuery $.ajax(), $.post sending “OPTIONS” as REQUEST_METHOD in Firefox
... you can use a JSONP callback instead:
$.getJSON( 'http://<url>/api.php?callback=?', function ( data ) { alert ( data ); } );
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Migration: Cannot add foreign key constraint
...ed after running migrate:make. E.g. 2014_05_10_165709_create_student_table.php.
The solution was to rename the file with the foreign key to an earlier time than the file with the primary key as recommended here: http://forumsarchive.laravel.io/viewtopic.php?id=10246
I think I also had to add in $t...
What is the difference between buffer and cache memory in Linux?
...el will run heuristics to reclaim the memory by storing the cache data and allocating that memory to new process.
When any kind of file/data is requested then the kernel will look for a copy of the part of the file the user is acting on, and, if no such copy exists, it will allocate one new page of...
Why should I prefer to use member initialization lists?
...le, but imagine if you will that A's default constructor did more, such as allocating memory or opening files. You wouldn't want to do that unnecessarily.
Furthermore, if a class doesn't have a default constructor, or you have a const member variable, you must use an initializer list:
class A
{
p...
Filter Java Stream to 1 and only 1 element
...
Mostly because allocating an all-up List is more expensive than a single mutable reference.
– Louis Wasserman
Mar 27 '14 at 20:52
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