add test and fix

include/emio/buffer.hpp

@@ -217,7 +217,7 @@ class span_buffer : public buffer {
   constexpr span_buffer(span_buffer&&) noexcept = delete;
   constexpr span_buffer& operator=(const span_buffer&) = delete;
   constexpr span_buffer& operator=(span_buffer&&) noexcept = delete;
-  constexpr ~span_buffer() override = default;
+  constexpr ~span_buffer() override;
 
   /**
    * Obtains a view over the underlying string object.
@@ -254,6 +254,9 @@ class span_buffer : public buffer {
   std::span<char> span_;
 };
 
+// Out-of-line definition because of a GCC bug (93413). Fixed in GCC 13.
+inline constexpr span_buffer::~span_buffer() = default;
+
 /**
  * This class fulfills the buffer API by providing a fixed-size storage.
  * @tparam StorageSize The size of the storage.

test/compile_test/compile.cpp

@@ -6,10 +6,38 @@
 consteval auto created_with_span_buffer() {
   std::array<char, 5> storage{};
   emio::span_buffer buf{storage};
-  emio::result<std::span<char>> area = buf.get_write_area_of(4);
+  return storage;
+}
+
+consteval auto created_with_static_buffer() {
+  std::array<char, 5> storage{};
+  emio::static_buffer<5> buf{};
+  std::span<char> area = buf.get_write_area_of(5).value();
+  std::fill(area.begin(), area.end(), 'a');
+  std::copy(buf.view().begin(), buf.view().end(), storage.begin());
+  return storage;
+}
+
+consteval auto created_with_memory_buffer() {
+  std::array<char, 5> storage{};
+  emio::memory_buffer<0> buf{};
+  std::span<char> area = buf.get_write_area_of(5).value();
+  std::fill(area.begin(), area.end(), 'a');
+  std::copy(buf.view().begin(), buf.view().end(), storage.begin());
+  return storage;
+}
+
+consteval auto created_with_iterator_buffer() {
+  std::array<char, 5> storage{};
+  emio::iterator_buffer buf{storage.data()};
+  std::span<char> area = buf.get_write_area_of(5).value();
+  std::fill(area.begin(), area.end(), 'a');
   return storage;
 }
 
 int main() {
   created_with_span_buffer();
+  created_with_static_buffer();
+  created_with_memory_buffer();
+  created_with_iterator_buffer();
 }