Trait handlebars::HelperDef

pub trait HelperDef: Send + Sync {
    fn call(&self, ctx: &Context, h: &Helper, r: &Registry, rc: &mut RenderContext) -> Result<(), RenderError>;
}

Helper Definition

Implement HelperDef to create custom helper. You can retrieve useful information from these arguments.

• &Context: the context you are rendering
• &Helper: current helper template information, contains name, params, hashes and nested template
• &Registry: the global registry, you can find templates by name from registry
• &mut RenderContext: you can store variables (starts with @) in render context, for example, @index of #each.

By default, you can use bare function as helper definition because we have supported unboxed_closure. If you have stateful or configurable helper, you can create a struct to implement HelperDef.

Required Methods

fn call(&self, ctx: &Context, h: &Helper, r: &Registry, rc: &mut RenderContext) -> Result<(), RenderError>

Implementors

• impl<F: Send + Sync + for<'a, 'b, 'c, 'd, 'e> Fn(&'a Context, &'b Helper, &'c Registry, &'d mut RenderContext) -> Result<(), RenderError>> HelperDef for F