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

    /// Memory definition struct
    #[derive(Debug, PartialEq)]
    pub struct MemoryDefinition {
    	/// Minimum memory size
    	pub min: u32,
    	/// Maximum memory size
    	pub max: Option<u32>,
    	/// Memory data segments (static regions)
    	pub data: Vec<MemoryDataDefinition>,
    }

    /// Memory static region entry definition
    #[derive(Debug, PartialEq)]
    pub struct MemoryDataDefinition {
    	/// Segment initialization expression for offset
    	pub offset: elements::InitExpr,
    	/// Raw bytes of static region
    	pub values: Vec<u8>,
    }

    /// Memory and static regions builder
    pub struct MemoryBuilder<F=Identity> {
    	callback: F,
    	memory: MemoryDefinition,
    }

    impl MemoryBuilder {
    	/// New memory builder
    	pub fn new() -> Self {
    		MemoryBuilder::with_callback(Identity)
    	}
    }

    impl<F> MemoryBuilder<F> where F: Invoke<MemoryDefinition> {
    	/// New memory builder with callback (in chained context)
    	pub fn with_callback(callback: F) -> Self {
    		MemoryBuilder {
    			callback: callback,
    			memory: Default::default(),
    		}
    	}

    	/// Set/override minimum size
    	pub fn with_min(mut self, min: u32) -> Self {
    		self.memory.min = min;
    		self
    	}

    	/// Set/override maximum size
    	pub fn with_max(mut self, max: Option<u32>) -> Self {
    		self.memory.max = max;
    		self
    	}

    	/// Push new static region with initialized offset expression and raw bytes
    	pub fn with_data(mut self, index: u32, values: Vec<u8>) -> Self {
    		self.memory.data.push(MemoryDataDefinition {
    			offset: elements::InitExpr::new(vec![
    				elements::Instruction::I32Const(index as i32),
    				elements::Instruction::End,
    			]),
    			values: values,
    		});
    		self
    	}

    	/// Finalize current builder, spawning resulting struct
    	pub fn build(self) -> F::Result {
    		self.callback.invoke(self.memory)
    	}
    }

    impl Default for MemoryDefinition {
    	fn default() -> Self {
    		MemoryDefinition {
    			min: 1,
    			max: None,
    			data: Vec::new(),
    		}
    	}
    }

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