+ more test cases

src/JSON.cc

@@ -1099,7 +1099,8 @@ const JSON& JSON::operator[](const std::string& key) const
     // this [] operator only works for objects
     if (_type != value_type::object)
     {
-        throw std::domain_error("cannot get entry with key " + std::string(key) + " from " + _typename());
+        throw std::domain_error("cannot get entry with key " +
+                                std::string(key) + " from " + _typename());
     }
 
     // search for the key
@@ -1151,6 +1152,14 @@ JSON& JSON::at(const char* key)
     return _value.object->at(key);
 }
 
+/*!
+@copydoc JSON::at(const char *key) const
+*/
+const JSON& JSON::at(const std::string& key) const
+{
+    return at(key.c_str());
+}
+
 /*!
 This operator realizes read-only access to object elements given a string
 key.
@@ -1162,7 +1171,7 @@ key.
 @exception std::domain_error if object is not an object
 @exception std::out_of_range if key is not found (via std::map::at)
 */
-const JSON& JSON::at(const std::string& key) const
+const JSON& JSON::at(const char* key) const
 {
     // this [] operator only works for objects
     if (_type != value_type::object)
@@ -1175,6 +1184,7 @@ const JSON& JSON::at(const std::string& key) const
     return _value.object->at(key);
 }
 
+
 /*!
 Returns the size of the JSON object.
 

src/JSON.h

@@ -257,6 +257,8 @@ class JSON
     JSON& at(const char*);
     /// operator to get an element in an object
     const JSON& at(const std::string&) const;
+    /// operator to get an element in an object
+    const JSON& at(const char*) const;
 
     /// return the number of stored values
     size_t size() const noexcept;

test/JSON_unit.cc

@@ -507,6 +507,10 @@ TEST_CASE("object")
         JSON nonarray = 1;
         CHECK_THROWS_AS(const int i = nonarray["v1"], std::domain_error);
         CHECK_THROWS_AS(nonarray["v1"] = 10, std::domain_error);
+        {
+            const JSON c = {{"foo", "bar"}};
+            CHECK_THROWS_AS(c[std::string("baz")], std::out_of_range);
+        }
 
         // clear()
         JSON j7 = {{"k0", 0}, {"k1", 1}, {"k2", 2}, {"k3", 3}};