utils: Add bool specialization to cast::from_str()

This adds a specialization to `uhd::cast::from_str()` to handle `bool`
as a target type and interpret strings like 'y', 'Y', 'n', 'No', 'True',
'False', etc. as Boolean values, as well as the traditional '0' and '1'
(which also work).

1 files changed, 25 insertions, 0 deletions

diff --git a/host/lib/utils/cast.cpp b/host/lib/utils/cast.cpp
index 635d844ee..6b008ff45 100644
--- a/host/lib/utils/cast.cpp
+++ b/host/lib/utils/cast.cpp
@@ -5,10 +5,35 @@
 //
 
 #include <uhd/utils/cast.hpp>
+#include <uhd/exception.hpp>
+#include <boost/algorithm/string.hpp>
 
 using namespace uhd;
 
 template <>
+bool cast::from_str(const std::string& val)
+{
+    try {
+        return (std::stoi(val) != 0);
+    } catch (std::exception& ex) {
+        if (boost::algorithm::to_lower_copy(val) == "true"
+                   || boost::algorithm::to_lower_copy(val) == "yes"
+                   || boost::algorithm::to_lower_copy(val) == "y"
+                   || val == "1") {
+            return true;
+        } else if (boost::algorithm::to_lower_copy(val) == "false"
+                   || boost::algorithm::to_lower_copy(val) == "no"
+                   || boost::algorithm::to_lower_copy(val) == "n"
+                   || val == "0") {
+            return false;
+        } else {
+            throw uhd::runtime_error("Cannot convert `" + val + "' to boolean!");
+            return false;
+        }
+    }
+}
+
+template <>
 double cast::from_str(const std::string& val)
 {
     try {