Merge pull request #1900 from IntelPython/align-is_complex-with-stl-wrappers

Add support of CV-qualifiers in `is_complex<T>` helper

Author: antonwolfy

CHANGELOG.md

@@ -33,6 +33,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 * Fix warning in documentation generation caused by `diff` docstring [gh-1855](https://github.com/IntelPython/dpctl/pull/1855)
 * Fix additional warnings when generating docs [gh-1861](https://github.com/IntelPython/dpctl/pull/1861)
 * Add missing include of SYCL header to "math_utils.hpp" [gh-1899](https://github.com/IntelPython/dpctl/pull/1899)
+* Add support of CV-qualifiers in `is_complex<T>` helper [gh-1900](https://github.com/IntelPython/dpctl/pull/1900)
 
 ## [0.18.1] - Oct. 11, 2024
 

dpctl/tensor/libtensor/include/utils/type_utils.hpp

@@ -26,6 +26,7 @@
 #include <complex>
 #include <stdexcept>
 #include <sycl/sycl.hpp>
+#include <type_traits>
 #include <utility>
 
 namespace dpctl
@@ -35,13 +36,22 @@ namespace tensor
 namespace type_utils
 {
 
-template <class T> struct is_complex : std::false_type
+template <typename T, typename = void>
+struct is_complex : public std::false_type
 {
 };
-template <class T> struct is_complex<std::complex<T>> : std::true_type
+
+template <typename T>
+struct is_complex<
+    T,
+    std::enable_if_t<std::is_same_v<std::remove_cv_t<T>, std::complex<float>> ||
+                     std::is_same_v<std::remove_cv_t<T>, std::complex<double>>>>
+    : public std::true_type
 {
 };
 
+template <typename T> constexpr bool is_complex_v = is_complex<T>::value;
+
 template <typename dstTy, typename srcTy> dstTy convert_impl(const srcTy &v)
 {
     if constexpr (std::is_same<dstTy, srcTy>::value) {