uhd: Create discoverable feature registry implementation

Classes which want to implement discoverable_feature can simply inherit
from this registry and get access to an ergonomic map-backed registry of
features.

2 files changed, 46 insertions, 0 deletions

diff --git a/host/lib/features/CMakeLists.txt b/host/lib/features/CMakeLists.txt
new file mode 100644
index 000000000..2cdd1dd56
--- /dev/null
+++ b/host/lib/features/CMakeLists.txt
@@ -0,0 +1,12 @@
+#
+# Copyright 2020 Ettus Research, a National Instruments Brand
+#
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+
+########################################################################
+# This file included, use CMake directory variables
+########################################################################
+LIBUHD_APPEND_SOURCES(
+    ${CMAKE_CURRENT_SOURCE_DIR}/discoverable_feature_registry.cpp
+)
diff --git a/host/lib/features/discoverable_feature_registry.cpp b/host/lib/features/discoverable_feature_registry.cpp
new file mode 100644
index 000000000..5bed6a06e
--- /dev/null
+++ b/host/lib/features/discoverable_feature_registry.cpp
@@ -0,0 +1,34 @@
+//
+// Copyright 2020 Ettus Research, a National Instruments Brand
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+//
+
+#include <uhd/exception.hpp>
+#include <uhd/features/discoverable_feature.hpp>
+#include <uhdlib/features/discoverable_feature_registry.hpp>
+#include <vector>
+
+namespace uhd { namespace features {
+
+std::vector<std::string>
+discoverable_feature_registry::enumerate_features()
+{
+    std::vector<std::string> features;
+    for (auto& entry : _features) {
+        features.push_back(entry.second->get_feature_name());
+    }
+    return features;
+}
+
+discoverable_feature::sptr discoverable_feature_registry::get_feature_ptr(
+    discoverable_feature::feature_id_t feature_id)
+{
+    auto it = _features.find(feature_id);
+    if (it == _features.end()) {
+        return discoverable_feature::sptr();
+    }
+    return it->second;
+}
+
+}} // namespace uhd::features