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update variant access in arg_parse::get

v1
Brett 2023-08-18 19:15:21 -04:00
parent 1d03938f95
commit 0e17dff862
1 changed files with 17 additions and 1 deletions
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18
include/blt/parse/argparse.h
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@ -15,6 +15,7 @@
#include <blt/std/hashmap.h> #include <blt/std/hashmap.h>
#include <variant> #include <variant>
#include <algorithm> #include <algorithm>
#include <type_traits>
namespace blt namespace blt
{ {
@ -329,13 +330,28 @@ namespace blt
return std::holds_alternative<arg_data_internal_t>(v) && std::holds_alternative<T>(std::get<arg_data_internal_t>(v)); return std::holds_alternative<arg_data_internal_t>(v) && std::holds_alternative<T>(std::get<arg_data_internal_t>(v));
} }
/**
* Attempt to cast the variant stored in the arg results to the requested type
* if user is requesting an int, but holds a string, we are going to make the assumption the data can be converted
* it is up to the user to deal with the variant if they do not want this behaviour!
* @tparam T type to convert to
* @param v
* @return
*/
template<typename T> template<typename T>
static inline T& get(arg_data_t& v) static inline T& get(arg_data_t& v)
{ {
if constexpr (std::is_same_v<T, arg_data_vec_t>) if constexpr (std::is_same_v<T, arg_data_vec_t>)
return std::get<arg_data_vec_t>(v); return std::get<arg_data_vec_t>(v);
else else
return std::get<T>(std::get<arg_data_internal_t>(v)); {
auto t = std::get<arg_data_internal_t>(v);
// user is requesting an int, but holds a string, we are going to make the assumption the data can be converted
// it is up to the user to deal with the variant if they do not want this behaviour!
if constexpr (std::holds_alternative<std::string>(t) && std::is_same_v<int32_t, T>)
return std::stoi(std::get<std::string>(t));
return std::get<T>(t);
}
} }
public: public: