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    use crate::rust::vec::Vec;
    use super::invoke::{Identity, Invoke};
    use crate::elements;

    /// Data segment builder
    pub struct DataSegmentBuilder<F=Identity> {
    	callback: F,
    	// todo: add mapper once multiple memory refs possible
    	mem_index: u32,
    	offset: elements::InitExpr,
    	value: Vec<u8>,
    }

    impl DataSegmentBuilder {
    	/// New data segment builder
    	pub fn new() -> Self {
    		DataSegmentBuilder::with_callback(Identity)
    	}
    }

    impl<F> DataSegmentBuilder<F> {
    	/// New data segment builder inside the chain context
    	pub fn with_callback(callback: F) -> Self {
    		DataSegmentBuilder {
    			callback: callback,
    			mem_index: 0,
    			offset: elements::InitExpr::empty(),
    			value: Vec::new(),
    		}
    	}

    	/// Set offset initialization instruction. `End` instruction will be added automatically.
    	pub fn offset(mut self, instruction: elements::Instruction) -> Self {
    		self.offset = elements::InitExpr::new(vec![instruction, elements::Instruction::End]);
    		self
    	}

    	/// Set the bytes value of the segment
    	pub fn value(mut self, value: Vec<u8>) -> Self {
    		self.value = value;
    		self
    	}
    }

    impl<F> DataSegmentBuilder<F> where F: Invoke<elements::DataSegment> {
    	/// Finish current builder, spawning resulting struct
    	pub fn build(self) -> F::Result {
    		self.callback.invoke(
    			elements::DataSegment::new(
    				self.mem_index,
    				Some(self.offset),
    				self.value,
    			)
    		)
    	}
    }

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