remove coroutine_type, but keep public context

examples/coroutine2.cc

@@ -17,18 +17,18 @@ int main() {
 
     generator<int> x{f};
     /* coroutine_context exists as a base type for any coroutine */
-    coroutine_context &ctx = x;
+    coroutine_context *ctx = &x;
 
     writefln(
         "generator is coroutine<int()>: %s",
-        bool(ctx.coroutine<coroutine<int()>>())
+        bool(dynamic_cast<coroutine<int()> *>(ctx))
     );
     writefln(
         "generator is generator<int>: %s",
-        bool(ctx.coroutine<generator<int>>())
+        bool(dynamic_cast<generator<int> *>(ctx))
     );
 
-    generator<int> &gr = *ctx.coroutine<generator<int>>();
+    generator<int> &gr = dynamic_cast<generator<int> &>(*ctx);
     writefln("value of cast back generator: %s", gr.value());
 }
 

ostd/coroutine.hh

@@ -399,10 +399,6 @@ public:
     template<typename F>
     F const *target() const { return p_stor.p_func.target(); }
 
-    std::type_info const &coroutine_type() const {
-        return typeid(coroutine);
-    }
-
 private:
     void resume_call() {
         p_stor.call_helper(*this);
@@ -572,10 +568,6 @@ public:
     template<typename F>
     F const *target() const { return p_func.target(); }
 
-    std::type_info const &coroutine_type() const {
-        return typeid(generator);
-    }
-
 private:
     void resume_call() {
         p_func(yield_type{*this});

ostd/internal/context.hh

@@ -43,24 +43,6 @@ namespace detail {
 } /* namespace detail */
 
 struct coroutine_context {
-    virtual std::type_info const &coroutine_type() const = 0;
-
-    template<typename T>
-    T *coroutine() {
-        if (coroutine_type() == typeid(T)) {
-            return reinterpret_cast<T *>(this);
-        }
-        return nullptr;
-    }
-
-    template<typename T>
-    T const *coroutine() const {
-        if (coroutine_type() == typeid(T)) {
-            return reinterpret_cast<T const *>(this);
-        }
-        return nullptr;
-    }
-
 protected:
     coroutine_context() {}
     ~coroutine_context() {