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Each "route" is a rust function with a macro attached to it. The function will define code that should respond to an HTTP request. The macro that is written as part of the function declaration will define which HTTP Method (such as GET, POST, PUT, etc.) it should be handle, as well as a pattern describing the URL it should be relevant to.
The rsx! macro in the Dioxus front-end framework is an example of a function-like macro. [127] [128] Theserde_derive macro [129] provides a commonly used library for generating code for reading and writing data in many formats, such as JSON. Attribute macros are commonly used for language bindings, such as the extendr library for Rust bindings ...
Tokio is a software library for the Rust programming language. It provides a runtime and functions that enable the use of asynchronous I/O, allowing for concurrency in regards to task completion. [2] [3] [4] Tokio was released in August 2016 for Rust, a general-purpose programming language.
For example, in the program-defined function redefinition example, the my-unless macro can reside in its own package, where user-defined-operator is a private symbol in that package. The symbol user-defined-operator occurring in the user code will then be a different symbol, unrelated to the one used in the definition of the my-unless macro.
Macro languages may be restricted to acting on specially labeled code regions (pre-fixed with a # in the case of the C preprocessor). Alternatively, they may not, but in this case it is still often undesirable to (for instance) expand a macro embedded in a string literal, so they still need a rudimentary awareness of syntax. That being the case ...
Rust has the concat! macro and the format! macro, of which the latter is the most prevalent throughout the documentation and examples. ... are multiline), Rust ...
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A parameterized macro is a macro that is able to insert given objects into its expansion. This gives the macro some of the power of a function. As a simple example, in the C programming language, this is a typical macro that is not a parameterized macro, i.e., a parameterless macro: #define PI 3.14159