allow c++20

Author: wusatosi

.github/workflows/ci_tests.yml

@@ -37,7 +37,7 @@ jobs:
             c: gcc
           - cpp: clang++
             c: clang
-        cpp_version: [23]
+        cpp_version: [20, 23]
         cmake_args:
           - description: "Default"
             args: ""
@@ -50,7 +50,7 @@ jobs:
             compiler:
               cpp: g++
               c: gcc
-            cpp_version: 23
+            cpp_version: 20
             cmake_args:
               description: "Dynamic"
               cmake_args: "-DBUILD_SHARED_LIBS=on"

include/beman/inplace_vector/inplace_vector.hpp

@@ -312,7 +312,7 @@ template <class = void>
 [[noreturn]]
 static constexpr void __assert_failure(char const *__file, int __line,
                                        char const *__msg) {
-  if consteval {
+  if (std::is_constant_evaluated()) {
     throw __msg; // TODO: std lib implementer, do better here
   } else {
     fprintf(stderr, "%s(%d): %s\n", __file, __line, __msg);

tests/beman/inplace_vector/ref_impl.test.cpp

@@ -20,6 +20,7 @@
 #include <iostream>
 #include <memory>
 #include <string>
+#include <type_traits>
 #include <vector>
 
 #define CHECK(...)                                                             \
@@ -183,7 +184,7 @@ template <typename T, std::size_t N> constexpr void test_il_constructor() {
   for (size_t i = 0; i < N; ++i)
     CHECK(v[i] == T(i));
   CHECK(11 > N);
-  if !consteval {
+  if (!std::is_constant_evaluated()) {
     CHECK_THROWS(
         ([&] { const vector<T, N> x({0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10}); }()),
         std::bad_alloc);
@@ -212,7 +213,7 @@ template <typename T, std::size_t N> constexpr void test_il_assignment() {
   CHECK(v.size() == N);
   for (size_t i = 0; i < N; ++i)
     CHECK(v[i] == T(i));
-  if !consteval {
+  if (!std::is_constant_evaluated()) {
     CHECK_THROWS(([&] {
                    [[maybe_unused]] const vector<T, N> x = {0, 1, 2, 3, 4, 5,
                                                             6, 7, 8, 9, 10};