add workaround for msvc constexpr init issue (closes #8)

Author: KRM7

.github/workflows/windows.yml

@@ -0,0 +1,46 @@
+name: windows
+
+on: push
+
+jobs:
+  build:
+    runs-on: windows-2022
+    strategy:
+      fail-fast: false
+      matrix:
+        build-type: [ Release, Debug ]
+        compiler: [
+            { name: msvc, toolset: v143 }, 
+            { name: clang, toolset: ClangCL }
+        ]
+
+    defaults:
+      run:
+        working-directory: ${{ github.workspace }}/build
+
+    name: ${{ matrix.compiler.name }}-${{ matrix.build-type }}
+
+
+    steps:
+    - name: checkout-repo
+      uses: actions/checkout@v4
+
+    - name: setup-catch
+      env:
+        CMAKE_GENERATOR: "Visual Studio 17 2022"
+        CMAKE_GENERATOR_TOOLSET: ${{ matrix.compiler.toolset }}
+        CMAKE_GENERATOR_PLATFORM: ${{ matrix.platform }}
+      run: bash ../tools/install_catch.sh ${{ matrix.build-type }}
+
+    - name: setup-build
+      env:
+        CMAKE_GENERATOR: "Visual Studio 17 2022"
+        CMAKE_GENERATOR_TOOLSET: ${{ matrix.compiler.toolset }}
+        CMAKE_GENERATOR_PLATFORM: ${{ matrix.platform }}
+      run: cmake .. -DCMAKE_BUILD_TYPE=${{ matrix.build-type }} -DSMP_BUILD_BENCHMARKS=OFF
+
+    - name: build
+      run: cmake --build . --parallel --config ${{ matrix.build-type }}
+    
+    - name: run-tests
+      run: ctest --output-on-failure --schedule-random

.gitignore

@@ -6,3 +6,4 @@
 *.hint
 
 .cache/
+out/

src/small_unique_ptr.hpp

@@ -25,6 +25,12 @@ namespace smp::detail
     template<std::integral T>
     constexpr T max_pow2_factor(T n) noexcept { return n & (~n + 1); }
 
+    template<typename T, typename U, std::size_t N>
+    constexpr const void fill(T(&arr)[N], U value)
+    {
+        for (std::size_t i = 0; i < N; i++) 
+            arr[i] = value;
+    }
 
     struct ignore_t
     {
@@ -163,6 +169,14 @@ namespace smp::detail
         using pointer  = std::remove_cv_t<T>*;
         using buffer_t = unsigned char[buffer_size_v<T, Size>];
 
+        constexpr small_unique_ptr_base() noexcept
+        {
+            if (std::is_constant_evaluated())
+            {
+                detail::fill(buffer_, 0);
+            }
+        }
+
         pointer buffer(std::ptrdiff_t offset = 0) const noexcept
         {
             assert(offset <= sizeof(buffer_t));
@@ -234,6 +248,14 @@ namespace smp::detail
         using pointer  = std::remove_cv_t<T>*;
         using buffer_t = unsigned char[buffer_size_v<T, Size>];
 
+        constexpr small_unique_ptr_base() noexcept
+        {
+            if (std::is_constant_evaluated())
+            {
+                detail::fill(buffer_, 0);
+            }
+        }
+
         pointer buffer(std::ptrdiff_t offset = 0) const noexcept
         {
             assert(offset <= sizeof(buffer_t));