From 9b614eaae34c723f6d2b5e19403986624ff5cf76 Mon Sep 17 00:00:00 2001
From: ararem <48875125+Ararem@users.noreply.github.com>
Date: Wed, 4 Jan 2023 13:00:42 +0100
Subject: [PATCH] Implement DataTypeKind for `usize` and `isize`

This allows direct use of the size types in `imgui-rs` functions, like `Slider`s. Previously, they had to be cast, passed in, then cast back. This change allows for direct use (no casts necessary)
---
 imgui/src/internal.rs | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/imgui/src/internal.rs b/imgui/src/internal.rs
index 0af90a1..bcb7e6a 100644
--- a/imgui/src/internal.rs
+++ b/imgui/src/internal.rs
@@ -165,3 +165,43 @@ unsafe impl DataTypeKind for f32 {
 unsafe impl DataTypeKind for f64 {
     const KIND: DataType = DataType::F64;
 }
+
+unsafe impl DataTypeKind for usize {
+    #[cfg(target_pointer_width = "16")]
+    const KIND: DataType = DataType::U16;
+
+    #[cfg(target_pointer_width = "32")]
+    const KIND: DataType = DataType::U32;
+
+    #[cfg(target_pointer_width = "64")]
+    const KIND: DataType = DataType::U64;
+
+    // Fallback for when we are on a weird system width
+    //
+    #[cfg(not(any(
+        target_pointer_width = "16",
+        target_pointer_width = "32",
+        target_pointer_width = "64"
+    )))]
+    compile_error!("cannot impl DataTypeKind for usize: unsupported target pointer width. supported values are 16, 32, 64");
+}
+
+unsafe impl DataTypeKind for isize {
+    #[cfg(target_pointer_width = "16")]
+    const KIND: DataType = DataType::I16;
+
+    #[cfg(target_pointer_width = "32")]
+    const KIND: DataType = DataType::I32;
+
+    #[cfg(target_pointer_width = "64")]
+    const KIND: DataType = DataType::I64;
+
+    // Fallback for when we are on a weird system width
+    //
+    #[cfg(not(any(
+        target_pointer_width = "16",
+        target_pointer_width = "32",
+        target_pointer_width = "64"
+    )))]
+    compile_error!("cannot impl DataTypeKind for isize: unsupported target pointer width. supported values are 16, 32, 64");
+}