save-state-1

sbf-cpp/Questions.md

@@ -0,0 +1,18 @@
+## Why do I have to cast std::nullopt to a specific optional type when calling a templated function i.e.
+
+```c++
+template<typename T>
+void DoSomething(std::optional<T> = std::nullopt, bool report_errors = false);
+```
+
+```text
+DoSomething() works fine.
+DoSomething(std::nullopt, true) no matching function for call to 'DoSomething' Do_Something<std::optional<string>, bool>(
+```
+
+## Which is uglier
+```c++
+(*after_each)()
+after_each->operator()()
+after_each.value()();
+```