Macro function 

function!() { /* proc-macro */ }

Procedural macro for creating function expressions

Syntax

function!(sin)              // Zero args
function!(sin, x)           // One arg (x is an Expression)
function!(log, x, y)        // Two args
function!(f, a, b, c)       // N args

Examples

use mathhook_macros::function;
use mathhook_core::expr;

// Zero-argument function
let gamma_call = function!(gamma);

// Single argument
let x = expr!(x);
let sin_x = function!(sin, x);

// Multiple arguments
let log_xy = function!(log, x, expr!(2));