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List of Delphi language features and version in which they were introduced/deprecated
...elphi 1 Features
The full list from Embarcadero: What's New
See also: David I's list
To summarize:
Delphi 10.3.x, 10.4 (not yet out, this is speculative)
Custom managed records
Nullable types
Support for macOS 64-bit
Support for Android 64-bit
Delphi 10.3
The 64-bit Linux compil...
Filter rows which contain a certain string
...:
dplyr::filter(df, !grepl("RTB",TrackingPixel))
Since you have not provided the original data, I will add a toy example using the mtcars data set. Imagine you are only interested in cars produced by Mazda or Toyota.
mtcars$type <- rownames(mtcars)
dplyr::filter(mtcars, grepl('Toyota|Mazda', ...
GridLayout and Row/Column Span Woe
The Android Developers Blog post introducing GridLayout shows this diagram of how spans impact automatic index allocation:
...
Why are margin/padding percentages in CSS always calculated against width?
...sanjaypoyzer I'd guess in the simplest case that browsers calculate block widths from the outside in (root to tips), then flow content into those blocks to determine their heights (tips to root).
– sam
Oct 10 '13 at 1:47
...
When to use std::forward to forward arguments?
...
Use it like your first example:
template <typename T> void f(T && x)
{
g(std::forward<T>(x));
}
template <typename ...Args> void f(Args && ...args)
{
g(std::forward<Args>(args)...);
}
That's because of the reference collapsing rules: If T =...
How do cache lines work?
... This answer makes absolutely no sense. What does the 64bit memory bandwidth (which is also wrong in that regard) to do with the 64 byte(!) not bit to do? Also the 10 to 30 ns are also totally wrong if you hit the Ram. It might be true for the L3 or L2 cache but not for the RAM where it is more l...
What is RSS and VSZ in Linux memory management
...
RSS is the Resident Set Size and is used to show how much memory is allocated to that process and is in RAM. It does not include memory that is swapped out. It does include memory from shared libraries as long as the pages from those lib...
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...
Scala type programming resources
...unction. Indeed, type-level programming makes heavy use of implicits.
Consider this example (taken from metascala and apocalisp):
sealed trait Nat
sealed trait _0 extends Nat
sealed trait Succ[N <: Nat] extends Nat
Here you have a peano encoding of the natural numbers. That is, you have a typ...
Reference: Comparing PHP's print and echo
...code. That source code involves the parser as well as opcode handlers. Consider a simple action such as displaying the number zero. Whether you use echo or print, the same handler " ZEND_ECHO_SPEC_CONST_HANDLER" will be invoked. The handler for print does one thing before it invokes the handler fo...