nvbench::state::set_stopping_criterion now also sets criterion params

This change closes gh-255 by alignign implementation of
state::set_stopping_criterion with that of
benchmark_base::set_stopping_criterion.

Author: oleksandr-pavlyk

nvbench/state.cuh

@@ -151,10 +151,7 @@ struct state
   /// Control the stopping criterion for the measurement loop.
   /// @{
   [[nodiscard]] const std::string &get_stopping_criterion() const { return m_stopping_criterion; }
-  void set_stopping_criterion(std::string criterion)
-  {
-    m_stopping_criterion = std::move(criterion);
-  }
+  void set_stopping_criterion(std::string criterion);
   /// @}
 
   /// If true, the benchmark is only run once, skipping all warmup runs and only

nvbench/state.cxx

@@ -16,6 +16,7 @@
  *  limitations under the License.
  */
 #include <nvbench/benchmark_base.cuh>
+#include <nvbench/criterion_manager.cuh>
 #include <nvbench/detail/throw.cuh>
 #include <nvbench/state.cuh>
 #include <nvbench/types.cuh>
@@ -300,4 +301,10 @@ void state::add_buffer_size(std::size_t num_bytes,
   }
 }
 
+void state::set_stopping_criterion(std::string criterion)
+{
+  m_stopping_criterion = std::move(criterion);
+  m_criterion_params   = criterion_manager::get().get_criterion(m_stopping_criterion).get_params();
+}
+
 } // namespace nvbench