[WIP] Generalized flag values

examples/CMakeLists.txt

@@ -130,7 +130,12 @@ add_cli_exe(enum enum.cpp)
 add_test(NAME enum_pass COMMAND enum -l 1)
 add_test(NAME enum_fail COMMAND enum -l 4)
 set_property(TEST enum_fail PROPERTY PASS_REGULAR_EXPRESSION
-    "--level: 4 not in {0,1,2}")
+    "--level: 4 not in {")
+
+add_cli_exe(digit_args digit_args.cpp)
+add_test(NAME digit_args COMMAND digit_args -h)
+set_property(TEST digit_args PROPERTY PASS_REGULAR_EXPRESSION
+    "-3{3}")
 
 add_cli_exe(modhelp modhelp.cpp)
 add_test(NAME modhelp COMMAND modhelp -a test -h)

examples/digit_args.cpp

@@ -0,0 +1,15 @@
+#include <CLI/CLI.hpp>
+#include <iostream>
+
+int main(int argc, char **argv) {
+    CLI::App app;
+
+    int val;
+    // add a set of flags with default values associate with them
+    app.add_flag("-1{1},-2{2},-3{3},-4{4},-5{5},-6{6}, -7{7}, -8{8}, -9{9}", val, "compression level");
+
+    CLI11_PARSE(app, argc, argv);
+
+    std::cout << "value = " << val << std::endl;
+    return 0;
+}

examples/enum.cpp

@@ -1,24 +1,17 @@
 #include <CLI/CLI.hpp>
-#include <sstream>
 
 enum class Level : int { High, Medium, Low };
 
-std::istream &operator>>(std::istream &in, Level &level) {
-    int i;
-    in >> i;
-    level = static_cast<Level>(i);
-    return in;
-}
-
-std::ostream &operator<<(std::ostream &in, const Level &level) { return in << static_cast<int>(level); }
-
 int main(int argc, char **argv) {
     CLI::App app;
 
     Level level;
-    app.add_option("-l,--level", level, "Level settings")
-        ->check(CLI::IsMember({Level::High, Level::Medium, Level::Low}))
-        ->type_name("enum/Level in {High=0, Medium=1, Low=2}");
+    // specify string->value mappings
+    std::vector<std::pair<std::string, Level>> map{
+        {"high", Level::High}, {"medium", Level::Medium}, {"low", Level::Low}};
+    // checked Transform does the translation and checks the results are either in one of the strings or one of the
+    // translations already
+    app.add_option("-l,--level", level, "Level settings")->transform(CLI::CheckedTransformer(map, CLI::ignore_case));
 
     CLI11_PARSE(app, argc, argv);