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protobuf 3.7.2

Rust implementation of Google protocol buffers
Documentation 
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/// Fixed size integers.
pub(crate) trait ProtobufFixed {
    /// Size of this fixed type in bytes.
    const LEN: u32;
}

impl ProtobufFixed for u32 {
    const LEN: u32 = 4;
}

impl ProtobufFixed for i32 {
    const LEN: u32 = 4;
}

impl ProtobufFixed for u64 {
    const LEN: u32 = 8;
}

impl ProtobufFixed for i64 {
    const LEN: u32 = 8;
}

impl ProtobufFixed for f32 {
    const LEN: u32 = 4;
}

impl ProtobufFixed for f64 {
    const LEN: u32 = 8;
}

/// Technically `bool` is not fixed, but it can be considered as fixed
/// for the purpose of encoding.
impl ProtobufFixed for bool {
    const LEN: u32 = 1;
}