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What is std::string::c_str() lifetime?
...td::string is destroyed or if a non-const member function of the string is called. So, usually you will want to make a copy of it if you need to keep it around.
In the case of your example, it appears that the results of c_str() are used safely, because the strings are not modified while in that s...
Are empty HTML5 data attributes valid?
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Valid, but they aren't boolean.
Custom data attributes specification doesn't mention any changes to empty attributes handling, so the general rules about empty attributes apply here:
Certain attributes may be specified by providing just the attribute name, with no value.
In the followi...
What's a redirect URI? how does it apply to iOS app for OAuth2.0?
...spot.se/2012/08/oauth-20-for-my-ninth-grader.html
The redirect URI is the callback entry point of the app. Think about how OAuth for Facebook works - after end user accepts permissions, "something" has to be called by Facebook to get back to the app, and that "something" is the redirect URI. Furthe...
How to synchronize a static variable among threads running different instances of a class in Java?
... {
count++;
}
}
}
Method 3 is the best in many cases because the lock object is not exposed outside of your class.
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Using lambda expressions for event handlers
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There are no performance implications since the compiler will translate your lambda expression into an equivalent delegate. Lambda expressions are nothing more than a language feature that the compiler translates into the exact same code that you are use...
Reading a string with scanf
...was under the impression that the correct way of reading a C string with scanf() went along the lines of
2 Answers
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Cannot pass null argument when using type hinting
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PHP 7.1 or newer (released 2nd December 2016)
You can explicitly declare a variable to be null with this syntax
function foo(?Type $t) {
}
this will result in
$this->foo(new Type()); // ok
$this->foo(null); // ok
$this->foo(); // error
So, if you want an optio...
In Hibernate Validator 4.1+, what is the difference between @NotNull, @NotEmpty, and @NotBlank?
I can't seem to be able to find a summary that distinguishes the difference between these three annotations.
3 Answers
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Intellij Idea 9/10, what folders to check into (or not check into) source control?
...eans to Intellij 9 Ultimate and need to know what files/folders should typically be excluded from source control as they are not "workstation portable", i.e.: they reference paths that only exist on one user's computer.
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Setting up two different static directories in node.js Express framework
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You can also set the path that static files will be served to the web from by specifying an additional (first) parameter to use() like so:
app.use("/public", express.static(__dirname + "/public"));
app.use("/public2", express.st...