fix const

Author: wusatosi

include/beman/inplace_vector/inplace_vector.hpp

@@ -77,7 +77,7 @@ template <typename T, std::size_t Capacity>
 struct inplace_vector_bytes_based_storage {
   alignas(T) std::array<std::byte, Capacity * sizeof(T)> elems;
 
-  T *begin() { return std::launder(reinterpret_cast<const T *>(elems.data())); }
+  T *begin() { return std::launder(reinterpret_cast<T *>(elems.data())); }
   const T *begin() const {
     return std::launder(reinterpret_cast<const T *>(elems.data()));
   }
@@ -605,7 +605,8 @@ class inplace_vector : public inplace_vector_base<T, Capacity> {
 #else
     // Note: placement-new may not be constexpr friendly
     // Avoiding placement-new may allow inplace_vector to be constexpr friendly
-    auto final = ::new (end()) T(std::forward<Args>(args)...);
+    // cast to void* here to adapt to a const T
+    auto final = ::new ((void *)end()) T(std::forward<Args>(args)...);
 #endif
     this->change_size(1);
     return *final;

tests/beman/inplace_vector/inplace_vector.test.cpp

@@ -7,7 +7,7 @@ using namespace beman::inplace_vector;
 struct NonTrivial {
   int z = 5;
 
-  bool operator==(NonTrivial const &other) { return this->z == other.z; }
+  bool operator==(NonTrivial const &other) const { return this->z == other.z; }
 };
 static_assert(!std::is_trivial_v<NonTrivial>);