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How to use base class's constructors and assignment operator in C++?
...rn *this;
}
};
The interesting thing is that this works even if you didn't explicitly define these functions (it then uses the compiler generated functions).
class ImplicitBase {
int value_;
// No operator=() defined
};
class Derived : public ImplicitBase {
const char* name_;
p...
What is the JSF resource library for and how should it be used?
...module/theme name where all of those resources commonly belong to.
Easier identifying
This way it's so much easier to specify and distinguish where those resources belong to and/or are coming from. Imagine that you happen to have a primefaces.css resource in your own webapp wherein you're overridi...
What is Cache-Control: private?
...er your question about why caching is working, even though the web-server didn't include the headers:
Expires: [a date]
Cache-Control: max-age=[seconds]
The server kindly asked any intermediate proxies to not cache the contents (i.e. the item should only be cached in a private cache, i.e. only o...
Dump a mysql database to a plaintext (CSV) backup from the command line
I'd like to avoid mysqldump since that outputs in a form that is only convenient for mysql to read. CSV seems more universal (one file per table is fine). But if there are advantages to mysqldump, I'm all ears. Also, I'd like something I can run from the command line (linux). If that's a mysql s...
Git pull results in extraneous “Merge branch” messages in commit log
... to use rebasing instead of merging is possible, but usually you should avoid it. Rebasing allows you to keep a linear history, but also removes any information about the branching that originally happened. It will also cause the history of the current branch being rewritten, recreating all commits ...
Using smart pointers for class members
...should) return a reference rather than a pointer. While this is true, I decided to return a raw pointer here because I meant this to be a short answer that one could generalize to the case where device could be nullptr, and to show that raw pointers are OK as long as one does not use them for manual...
Is “inline” without “static” or “extern” ever useful in C99?
...wer also answers your question, I think:
What does extern inline do?
The idea is that "inline" can be used in a header file, and then "extern inline" in a .c file. "extern inline" is just how you instruct the compiler which object file should contain the (externally visible) generated code.
[upd...
std::function and std::bind: what are they, and when should they be used?
...a,b) := f(a, 4, b);
g is a "partial application" of the function f: the middle argument has already been specified, and there are two left to go.
You can use std::bind to get g:
auto g = bind(f, _1, 4, _2);
This is more concise than actually writing a functor class to do it.
There are further...
#1071 - Specified key was too long; max key length is 1000 bytes
...lumn as you define the index. For example:
...
KEY `index` (`parent_menu_id`,`menu_link`(50),`plugin`(50),`alias`(50))
...
But what's the best prefix length for a given column? Here's a method to find out:
SELECT
ROUND(SUM(LENGTH(`menu_link`)<10)*100/COUNT(`menu_link`),2) AS pct_length_10,...
Is gcc 4.8 or earlier buggy about regular expressions?
...eatures long before C++11 was finished and before many other compilers provided any support, and that feedback really helped improve C++11. This was a Good ThingTM.
The <regex> code was never in a useful state, but was added as a work-in-progress like many other bits of code at the time. It w...