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Why can't I forward-declare a class in a namespace using double colons?
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There's a lot of excellent answers about the rationale involved in disallowing it. I just want to provide the boring standardese clause the specifically prohibits it. This holds true for C++17 (n4659).
The paragraph in question is [class.nam...
PDO's query vs execute
...only one function instead of two. The parameter binding operation provides excellent protection, but it might be expensive and possibly avoided if unnecessary.
Given a couple rare conditions:
If you can't reuse a prepared statement because it's not supported by the Microsoft ODBC driver.
If you'r...
SQL query return data from multiple tables
...use a union query
Left and Right Outer Joins (this stackOverflow answer is excellent to describe types of joins)
Intersect queries (and how to reproduce them if your database doesn't support them) - this is a function of SQL-Server (see info) and part of the reason I wrote this whole thing in the fi...
Best ways to teach a beginner to program? [closed]
...rate loops, variables, functions, conditionals, etc. This page provides an excellent tutorial.
After Logo, move to Python or Ruby. I recommend Python, as it's based on ABC, which was invented for the purpose of teaching programming.
When teaching programming, I must second EHaskins's suggestion ...
How does a Java HashMap handle different objects with the same hash code?
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You can find excellent information at http://javarevisited.blogspot.com/2011/02/how-hashmap-works-in-java.html
To Summarize:
HashMap works on the principle of hashing
put(key, value): HashMap stores both key and value object as Map.En...
Is there a generator version of `string.split()` in Python?
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Excellent! I had forgotten about finditer. If one were interested in doing something like splitlines, I would suggest using this RE: '(.*\n|.+$)' str.splitlines chops off the trainling newline though (something that I don't r...
Simultaneously merge multiple data.frames in a list
...the ... argument
reshape::merge_all(list_of_dataframes, ...)
Here is an excellent resource on different methods to merge data frames.
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MySQL 'create schema' and 'create database' - Is there any difference
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Excellent! I assumed schema is a part of a Database instance. Thanks very much!!
– asgs
Jan 1 '16 at 19:26
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Detect 7 inch and 10 inch tablet programmatically
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Excellent tips Sean. I used to check with px for tablets, but in some cases there are problems (Galaxy 3, 4, Note, has equal or more px than Nexus 7). Now I can also check for inch. Here is a list of many popular devices scre...
How is OAuth 2 different from OAuth 1?
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Eran Hammer-Lahav has done an excellent job in explaining the majority of the differences in his article Introducing OAuth 2.0. To summarize, here are the key differences:
More OAuth Flows to allow better support for non-browser based applications. Thi...