Initial population of solana-program-sdk

sdk/program/src/native_token.rs

@@ -0,0 +1,38 @@
+/// There are 10^9 lamports in one SOL
+pub const LAMPORTS_PER_SOL: u64 = 1_000_000_000;
+
+/// Approximately convert fractional native tokens (lamports) into native tokens (SOL)
+pub fn lamports_to_sol(lamports: u64) -> f64 {
+    lamports as f64 / LAMPORTS_PER_SOL as f64
+}
+
+/// Approximately convert native tokens (SOL) into fractional native tokens (lamports)
+pub fn sol_to_lamports(sol: f64) -> u64 {
+    (sol * LAMPORTS_PER_SOL as f64) as u64
+}
+
+use std::fmt::{Debug, Display, Formatter, Result};
+pub struct Sol(pub u64);
+
+impl Sol {
+    fn write_in_sol(&self, f: &mut Formatter) -> Result {
+        write!(
+            f,
+            "◎{}.{:09}",
+            self.0 / LAMPORTS_PER_SOL,
+            self.0 % LAMPORTS_PER_SOL
+        )
+    }
+}
+
+impl Display for Sol {
+    fn fmt(&self, f: &mut Formatter) -> Result {
+        self.write_in_sol(f)
+    }
+}
+
+impl Debug for Sol {
+    fn fmt(&self, f: &mut Formatter) -> Result {
+        self.write_in_sol(f)
+    }
+}