+/**
+RAII version of require_extension. Useful as a static local variable.
+*/
+struct RequireExtension
+{
+ RequireExtension(const std::string &e) { require_extension(e); }
+};
+
+/**
+Checks that the OpenGL version is at least a.b and throws if it isn't.
+*/
+void require_version(unsigned a, unsigned b);
+
+/**
+RAII version of require_version. Useful as a static local variable.
+*/
+struct RequireVersion
+{
+ RequireVersion(unsigned a, unsigned b) { require_version(a, b); }
+};
+