Add library code along with the imports info

examples/library/Forc.lock

@@ -5,25 +5,9 @@ source = "path+from-root-0DAF035ABF1276AD"
 [[package]]
 name = "library"
 source = "member"
-dependencies = [
-    "std",
-    "sway_libs",
-]
-
-[[package]]
-name = "standards"
-source = "git+https://github.com/FuelLabs/sway-standards?tag=v0.5.0#348f7175df4c012b23c86cdb18aab79025ca1f18"
 dependencies = ["std"]
 
 [[package]]
 name = "std"
 source = "git+https://github.com/fuellabs/sway?rev#4c2c38430264472221dd4c68142013d819843b01"
 dependencies = ["core"]
-
-[[package]]
-name = "sway_libs"
-source = "git+https://github.com/FuelLabs/sway-libs?tag=v0.22.0#172adbbcc36e561a56c5820209445f86f0856bfc"
-dependencies = [
-    "standards",
-    "std",
-]

examples/library/Forc.toml

@@ -5,4 +5,3 @@ license = "Apache-2.0"
 name = "library"
 
 [dependencies]
-sway_libs = { git = "https://github.com/FuelLabs/sway-libs", tag = "v0.22.0" }

examples/library/src/main.sw

@@ -1,15 +1,42 @@
-library;
+contract;
 
-use std::hash::sha256;
-use std::hash::Hash;
+// 1. Importing within the same project
+// Using "mod" keyword, you can define the library as a dependency within a program.
+mod sqrt_lib;
 
-/// Generates a SHA-256 hash of the input.
-pub fn generate_sha256<T: Hash>(input: T) -> b256 {
-    sha256(input)
-}
+// It is a good practice to import in ABI
+// It is also a good practice to define events and custom errors using this way
+
+// Using "use" keyword imports in a library
+// use srt_lib::*;
+
+// 2. Importing the standard library
+// The standard library consists of
+//   a. language primitives
+//   b. blockchain contextual operations
+//   c. native asset management
+//   etc.
+// Functions like msg.sender(), block.timestamp(),etc are found here https://github.com/FuelLabs/sway/tree/master/sway-lib-std
+// use std::{
+//     identity::*,
+//     address::*,
+//     constants::*,
+//     auth::msg_sender,
+// };
 
-/// Verifies if the SHA-256 hash of the input matches the provided hash.
-pub fn verify_sha256<T: Hash>(input: T, expected_hash: b256) -> bool {
-    let computed_hash = sha256(input);
-    computed_hash == expected_hash
+// 3. Importing from a different project
+// If any library is not listed as a dependency, but present in forc.toml, you can use it as below.
+// Math libraries copied from https://github.com/sway-libs/concentrated-liquidity/
+// use math_lib::full_math::*;
+
+use ::sqrt_lib::math_sqrt;
+
+abi TestMath {
+    fn test_square_root(x: u256) -> u256;
 }
+
+impl TestMath for Contract {
+    fn test_square_root(x: u256) -> u256 {
+        math_sqrt(x)
+    }
+}

examples/library/src/sqrt_lib.sw

@@ -0,0 +1,16 @@
+library;
+
+pub fn math_sqrt(y: u256) -> u256 {
+    let mut z: u256 = 0;
+    if y > 3 {
+        z = y;
+        let mut x = y / 2 + 1;
+        while x < z {
+            z = x;
+            x = (y / x + x) / 2;
+        }
+    } else if y != 0 {
+        z = 1;
+    }
+    z
+}