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

    pub struct ValueTypeBuilder<F=Identity> {
    	callback: F,
    }

    impl<F> ValueTypeBuilder<F> where F: Invoke<elements::ValueType> {
    	pub fn with_callback(callback: F) -> Self {
    		ValueTypeBuilder { callback: callback }
    	}

    	pub fn i32(self) -> F::Result {
    		self.callback.invoke(elements::ValueType::I32)
    	}

    	pub fn i64(self) -> F::Result {
    		self.callback.invoke(elements::ValueType::I64)
    	}

    	pub fn f32(self) -> F::Result {
    		self.callback.invoke(elements::ValueType::F32)
    	}

    	pub fn f64(self) -> F::Result {
    		self.callback.invoke(elements::ValueType::F64)
    	}
    }

    pub struct OptionalValueTypeBuilder<F=Identity> {
    	callback: F,
    }

    impl<F> OptionalValueTypeBuilder<F> where F: Invoke<Option<elements::ValueType>> {
    	pub fn with_callback(callback: F) -> Self {
    		OptionalValueTypeBuilder { callback: callback }
    	}

    	pub fn i32(self) -> F::Result {
    		self.callback.invoke(Some(elements::ValueType::I32))
    	}

    	pub fn i64(self) -> F::Result {
    		self.callback.invoke(Some(elements::ValueType::I64))
    	}

    	pub fn f32(self) -> F::Result {
    		self.callback.invoke(Some(elements::ValueType::F32))
    	}

    	pub fn f64(self) -> F::Result {
    		self.callback.invoke(Some(elements::ValueType::F64))
    	}
    }

    pub struct ValueTypesBuilder<F=Identity> {
    	callback: F,
    	value_types: Vec<elements::ValueType>,
    }

    impl<F> ValueTypesBuilder<F> where F: Invoke<Vec<elements::ValueType>> {
    	pub fn with_callback(callback: F) -> Self {
    		ValueTypesBuilder {
    			callback: callback,
    			value_types: Vec::new(),
    		}
    	}

    	pub fn i32(mut self) -> Self {
    		self.value_types.push(elements::ValueType::I32);
    		self
    	}

    	pub fn i64(mut self) -> Self {
    		self.value_types.push(elements::ValueType::I64);
    		self
    	}

    	pub fn f32(mut self) -> Self {
    		self.value_types.push(elements::ValueType::F32);
    		self
    	}

    	pub fn f64(mut self) -> Self {
    		self.value_types.push(elements::ValueType::F64);
    		self
    	}

    	pub fn build(self) -> F::Result {
    		self.callback.invoke(self.value_types)
    	}
    }

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