Adding complex numbers

CHANGELOG.md

@@ -5,6 +5,7 @@
 * Ini output now includes `=false` when `default_also` is true
 * Ini no longer lists the help pointer
 * Added test for inclusion in multiple files and linking, fixed issues (rarely needed for CLI, but nice for tools)
+* Support for complex numbers
 
 ## Version 0.8
 

README.md

@@ -101,6 +101,8 @@ app.add_options(option_name,
                 help_string="",
                 default=false)
 
+app.add_complex(... // Special case: support for complex numbers
+
 app.add_flag(option_name,
              int_or_bool = nothing,
              help_string="")

include/CLI/App.hpp

@@ -399,6 +399,33 @@ public:
         return opt;
     }
 
+    /// Add a complex number
+    template<typename T>
+    Option* add_complex(
+			std::string name, T& variable,
+			std::string description="", bool defaulted=false,
+			std::string label="COMPLEX") {
+		CLI::callback_t fun = [&variable](results_t res){
+			if(res.size()!=2)
+				return false;
+			double x,y;
+			bool worked = detail::lexical_cast(res[0], x)
+				&& detail::lexical_cast(res[1], y);
+			if(worked)
+				variable = T(x,y);
+			return worked;
+		};
+
+		CLI::Option* opt = add_option(name, fun, description, defaulted);
+		opt->set_custom_option(label, 2);
+		if(defaulted) {
+			std::stringstream out;
+			out << variable;
+			opt->set_default_val(out.str());
+		}
+		return opt;
+	}
+
 
     /// Add a configuration ini file option
     Option* add_config(std::string name="--config",

tests/NewParseTest.cpp

@@ -58,3 +58,34 @@ TEST_F(TApp, DefaultComplex) {
 
     EXPECT_EQ(cx(4,3), comp);
 }
+
+TEST_F(TApp, BuiltinComplex) {
+    cx comp {1, 2};
+    app.add_complex("-c,--complex", comp, "", true);
+
+    args = {"-c", "4", "3"};
+
+    std::string help = app.help();
+    EXPECT_THAT(help, HasSubstr("1"));
+    EXPECT_THAT(help, HasSubstr("2"));
+    EXPECT_THAT(help, HasSubstr("COMPLEX"));
+
+    EXPECT_EQ(cx(1,2), comp);
+
+    run();
+
+    EXPECT_EQ(cx(4,3), comp);
+
+}
+
+
+TEST_F(TApp, BuiltinComplexIgnoreI) {
+    cx comp {1, 2};
+    app.add_complex("-c,--complex", comp);
+
+    args = {"-c", "4", "3i"};
+
+    run();
+
+    EXPECT_EQ(cx(4,3), comp);
+}