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Обсуждение на тему: Rust r
Rust r
The r character at the start of a string literal denotes a raw string literal. In a normal string literal, there are some characters that you need to escape to make them part of the string, such as and . What makes a raw string literal? The rust reference defines a raw string literal as starting with the character u0072 (r), followed by zero or more of the character u0023 () and a u0022 (double-quote) character. Зачем нужен rust в r? Первый вопрос, который должен возникнуть у читателя -- а зачем вообще использовать rust вместе с r ? Ответ довольно прост rust -- новый системный язык программирования,.
Rust is a modern alternative to c and compiled rust code is abi compatible with c. Many rust libraries include c api headers so that the compiled rust code can be called from rcc as if it were c code. In an interactive r session one may use rextendrrustfunction and friends to quickly prototype rust code. In an r package context, one may use rextendruseextendr() to setup a rust powered r-package.
In rust, the r symbol (sometimes called a raw identifier) is used to write an identifier that is a rust keyword. This is useful when you need to use a keyword as an identifier in your code. Here is an example of how to use the r symbol in rusti saw rvariable in here. What does it do? Whats the difference from the normal variable? How come rvariable allowed to use (fvariable or other alphabet does not work)? Is it related thi all, in c, there is a raw string syntax that looks like this stdstring query rsql( select email from users where username foo )sql the sql part serves as a delimiter, similar to how is used in raw rust string literals let query r select email from users where username foo in addition to making it.
The extendr suite of software packages provides a rust extension mechanism for r, thus bringing the computing power of rust to the statistical programming environment of r. The following code provides a simple illustration of how extendr achieves this. This is meant to be a step by step guide through the features of the rust programming language. .