quickfix 0.2.1

High level binding to quickfix C++ library
Documentation 
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use std::fmt;

use quickfix_ffi::{
    FixHeader_addGroup, FixHeader_copy, FixHeader_copyGroup, FixHeader_delete, FixHeader_getField,
    FixHeader_new, FixHeader_removeField, FixHeader_setField, FixHeader_t,
};

use crate::{
    utils::{ffi_code_to_result, read_checked_cstr},
    FieldMap, Group, IntoFixValue, QuickFixError,
};

/// Header part of a FIX message.
pub struct Header(pub(crate) FixHeader_t);

impl Header {
    /// Create new empty struct.
    pub fn new() -> Self {
        Self::default()
    }
}

impl FieldMap for Header {
    fn get_field(&self, tag: i32) -> Option<String> {
        unsafe { FixHeader_getField(self.0, tag) }.map(read_checked_cstr)
    }

    fn set_field<V: IntoFixValue>(&mut self, tag: i32, value: V) -> Result<(), QuickFixError> {
        let fix_value = value.into_fix_value()?;
        ffi_code_to_result(unsafe { FixHeader_setField(self.0, tag, fix_value.as_ptr()) })
    }

    fn remove_field(&mut self, tag: i32) -> Result<(), QuickFixError> {
        ffi_code_to_result(unsafe { FixHeader_removeField(self.0, tag) })
    }

    fn add_group(&mut self, group: &Group) -> Result<(), QuickFixError> {
        ffi_code_to_result(unsafe { FixHeader_addGroup(self.0, group.0) })?;
        Ok(())
    }

    fn clone_group(&self, index: i32, tag: i32) -> Option<Group> {
        unsafe { FixHeader_copyGroup(self.0, index, tag) }.map(Group)
    }
}

impl Clone for Header {
    fn clone(&self) -> Self {
        Self(unsafe { FixHeader_copy(self.0) }.expect("Fail to clone Header"))
    }
}

impl fmt::Debug for Header {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_tuple("Header").finish()
    }
}

impl Default for Header {
    fn default() -> Self {
        unsafe { FixHeader_new() }
            .map(Self)
            .expect("Fail to allocate new Header")
    }
}

impl Drop for Header {
    fn drop(&mut self) {
        unsafe { FixHeader_delete(self.0) }
    }
}