host: Add char* overload for device_addr_t

This allows constructing a multi_usrp using a string constant:
```
auto usrp = uhd::usrp::multi_usrp::make("type=x4xx");
```

3 files changed, 12 insertions, 6 deletions

diff --git a/host/include/uhd/types/device_addr.hpp b/host/include/uhd/types/device_addr.hpp
index 869f4a862..87cce626d 100644
--- a/host/include/uhd/types/device_addr.hpp
+++ b/host/include/uhd/types/device_addr.hpp
@@ -44,6 +44,12 @@ public:
     device_addr_t(const std::string& args = "");
 
     /*!
+     * Create a device address from an args string.
+     * \param args the arguments string
+     */
+    device_addr_t(const char* args);
+
+    /*!
      * Create a device address from a std::map
      * \param info the device info map
      */
diff --git a/host/lib/include/uhdlib/usrp/constrained_device_args.hpp b/host/lib/include/uhdlib/usrp/constrained_device_args.hpp
index e0c2c9b90..d3b52ea01 100644
--- a/host/lib/include/uhdlib/usrp/constrained_device_args.hpp
+++ b/host/lib/include/uhdlib/usrp/constrained_device_args.hpp
@@ -244,12 +244,6 @@ public: // Methods
     constrained_device_args_t() {}
     virtual ~constrained_device_args_t() {}
 
-    void parse(const std::string& str_args)
-    {
-        device_addr_t dev_args(str_args);
-        _parse(dev_args);
-    }
-
     void parse(const device_addr_t& dev_args)
     {
         _parse(dev_args);
diff --git a/host/lib/types/device_addr.cpp b/host/lib/types/device_addr.cpp
index 01dd46f5c..8f0fffa75 100644
--- a/host/lib/types/device_addr.cpp
+++ b/host/lib/types/device_addr.cpp
@@ -44,6 +44,12 @@ device_addr_t::device_addr_t(const std::string& args)
     }
 }
 
+device_addr_t::device_addr_t(const char* args) :
+    device_addr_t(std::string(args))
+{
+    // No additional construction is necessary
+}
+
 device_addr_t::device_addr_t(const std::map<std::string, std::string>& info)
 {
     for (auto& t : info) {