40 lines
1.4 KiB
Rust
40 lines
1.4 KiB
Rust
// SPDX-License-Identifier: CC0-1.0
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//! Various macros used by the Rust Bitcoin ecosystem.
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/// Asserts a boolean expression at compile time.
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#[macro_export]
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macro_rules! const_assert {
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($x:expr $(; $message:expr)?) => {
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const _: () = {
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if !$x {
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// We can't use formatting in const, only concating literals.
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panic!(concat!("assertion ", stringify!($x), " failed" $(, ": ", $message)?))
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}
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};
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}
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}
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/// Adds an implementation of `pub fn to_hex(&self) -> String` if `alloc` feature is enabled.
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///
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/// The added function allocates a `String` then calls through to [`core::fmt::LowerHex`].
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///
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/// Note: Calling this macro assumes that the calling crate has an `alloc` feature that also activates the
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/// `alloc` crate. Calling this macro without the `alloc` feature enabled is a no-op.
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#[macro_export]
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macro_rules! impl_to_hex_from_lower_hex {
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($t:ident, $hex_len_fn:expr) => {
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impl $t {
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/// Gets the hex representation of this type
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pub fn to_hex(&self) -> alloc::string::String {
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use core::fmt::Write;
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let mut hex_string = alloc::string::String::with_capacity($hex_len_fn(self));
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write!(&mut hex_string, "{:x}", self).expect("writing to string shouldn't fail");
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hex_string
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}
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}
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};
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}
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