utils: cast: Add from_str() typecast

This is the inverse to std::to_string(), and we can overload it with
UHD-internal types.

2 files changed, 40 insertions, 0 deletions

diff --git a/host/lib/utils/CMakeLists.txt b/host/lib/utils/CMakeLists.txt
index b4dd72c94..74b292fbb 100644
--- a/host/lib/utils/CMakeLists.txt
+++ b/host/lib/utils/CMakeLists.txt
@@ -219,6 +219,7 @@ set_source_files_properties(
 # Append sources
 ########################################################################
 LIBUHD_APPEND_SOURCES(
+    ${CMAKE_CURRENT_SOURCE_DIR}/cast.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/csv.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/config_parser.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/compat_check.cpp
diff --git a/host/lib/utils/cast.cpp b/host/lib/utils/cast.cpp
new file mode 100644
index 000000000..635d844ee
--- /dev/null
+++ b/host/lib/utils/cast.cpp
@@ -0,0 +1,39 @@
+//
+// Copyright 2019 Ettus Research, a National Instruments Brand
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+//
+
+#include <uhd/utils/cast.hpp>
+
+using namespace uhd;
+
+template <>
+double cast::from_str(const std::string& val)
+{
+    try {
+        return std::stod(val);
+    } catch (std::invalid_argument&) {
+        throw uhd::runtime_error(std::string("Cannot convert `") + val + "' to double!");
+    } catch (std::out_of_range&) {
+        throw uhd::runtime_error(std::string("Cannot convert `") + val + "' to double!");
+    }
+}
+
+template <>
+int cast::from_str(const std::string& val)
+{
+    try {
+        return std::stoi(val);
+    } catch (std::invalid_argument&) {
+        throw uhd::runtime_error(std::string("Cannot convert `") + val + "' to int!");
+    } catch (std::out_of_range&) {
+        throw uhd::runtime_error(std::string("Cannot convert `") + val + "' to int!");
+    }
+}
+
+template <>
+std::string cast::from_str(const std::string& val)
+{
+    return val;
+}