What is the meaning of pragma?
What is the meaning of pragma?
A pragma is a compiler directive that allows you to provide additional information to the compiler. This information can change compilation details that are not otherwise under your control. For example, the pack pragma affects the layout of data within a structure. Compiler pragmas are also called directives.
What #pragma once means?
In the C and C++ programming languages, #pragma once is a non-standard but widely supported preprocessor directive designed to cause the current source file to be included only once in a single compilation.
What does pragma mean in C programming?
The #pragma in C is a directive that is provided by the C standard in order to provide extra required details to the C compiler. These extra details can be anything that was somehow not passed within the program or the code logic. These directives, known as pragma are prefixed by the STDC in the standard.
Is #pragma once Portable?
That said, all major compiler supports it. If a compiler don’t know it, at least it will be ignored. As there is no standard behavior for #pragma once , you shouldn’t assume that the behavior will be the same on all compiler.
What is the meaning of Philautia?
self-love
Philautia (φιλαυτία, philautía) means “self-love”. To love oneself or “regard for one’s own happiness or advantage” has been conceptualized both as a basic human necessity and as a moral flaw, akin to vanity and selfishness, synonymous with amour-propre or egotism.
What is pragma in Python?
For Python, it’s simply a comment. It might be an annotation targeted at some external tool, which reads and analyzes Python code, similar, for example, to doctest’s #doctest: +ELLIPSIS annotations or PyLint’s # pylint: disable=W0613 style annotations.
Where can I use pragma once?
We recommend the #pragma once directive for new code because it doesn’t pollute the global namespace with a preprocessor symbol. It requires less typing, it’s less distracting, and it can’t cause symbol collisions.
What is pragma in SQL?
The PRAGMA statement is an SQL extension specific to SQLite and used to modify the operation of the SQLite library or to query the SQLite library for internal (non-table) data. No error messages are generated if an unknown pragma is issued. Unknown pragmas are simply ignored.
Where should I put pragma once?
Using #pragma once will delegate the task, of detecting subsequent #include statements for the same file, to the compiler. It can do this efficiently and safely. As a user, there is no room for mistakes. Just place the directive in the first line of every header file.
What does the name pragma mean?
πράγμα,the Greek word; see pragmatism
What is the reason for adding pragma?
Adding Pragmas and Directives Vitis HLS pragmas and directives let you configure the synthesis results for your code. HLS Pragmas are added to the source code to enable the optimization or change in the original source code. Every time the code is synthesized, it is implemented according to the specified pragmas.
What exactly is a JavaScript pragma?
The code that consists of useful information on how a compiler or interpreter or assembler should process the program. pragma does not contribute anything to the programming language itself. pragma only affect the compiler behavior. pragma ‘s syntax may vary. JavaScript also has few pragmas, one of them is strict.
What is the pragma header?
The Pragma HTTP/1.0 general header is an implementation-specific header that may have various effects along the request-response chain. It is used for backwards compatibility with HTTP/1.0 caches where the Cache-Control HTTP/1.1 header is not yet present.
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