Fixed error with Rice 4.8

Author: ankane

CHANGELOG.md

@@ -2,6 +2,7 @@
 
 - Changed `Tensor#device` method to return `Device` instead of string
 - Fixed `item` method for multi-dimensional tensors
+- Fixed error with Rice 4.8
 
 ## 0.22.2 (2025-11-04)
 

ext/torch/templates.h

@@ -69,7 +69,7 @@ namespace Rice::detail {
 
     explicit From_Ruby(Arg* arg) : arg_(arg) { }
 
-    Convertible is_convertible(VALUE value) { return Convertible::Cast; }
+    double is_convertible(VALUE value) { return Convertible::Exact; }
 
     c10::complex<T> convert(VALUE x) {
       VALUE real = rb_funcall(x, rb_intern("real"), 0);
@@ -93,7 +93,7 @@ namespace Rice::detail {
 
     explicit From_Ruby(Arg* arg) : arg_(arg) { }
 
-    Convertible is_convertible(VALUE value) { return Convertible::Cast; }
+    double is_convertible(VALUE value) { return Convertible::Exact; }
 
     FanModeType convert(VALUE x) {
       auto s = String(x).str();
@@ -122,7 +122,7 @@ namespace Rice::detail {
 
     explicit From_Ruby(Arg* arg) : arg_(arg) { }
 
-    Convertible is_convertible(VALUE value) { return Convertible::Cast; }
+    double is_convertible(VALUE value) { return Convertible::Exact; }
 
     NonlinearityType convert(VALUE x) {
       auto s = String(x).str();
@@ -169,7 +169,7 @@ namespace Rice::detail {
 
     explicit From_Ruby(Arg* arg) : arg_(arg) { }
 
-    Convertible is_convertible(VALUE value) { return Convertible::Cast; }
+    double is_convertible(VALUE value) { return Convertible::Exact; }
 
     Scalar convert(VALUE x) {
       if (FIXNUM_P(x)) {

torch-rb.gemspec

@@ -16,5 +16,5 @@ Gem::Specification.new do |spec|
 
   spec.required_ruby_version = ">= 3.2"
 
-  spec.add_dependency "rice", ">= 4.7"
+  spec.add_dependency "rice", ">= 4.8"
 end