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customtypes.cpp
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customtypes.cpp
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#include <filesystem>
#include <iostream>
#include "clipp.hpp"
enum class MyEnum { A, B, C };
template <>
struct clipp::Value<MyEnum> {
static constexpr std::string_view typeName = "MyEnum";
static std::optional<MyEnum> parse(std::string_view str)
{
if (str == "a") {
return MyEnum::A;
} else if (str == "b") {
return MyEnum::B;
} else if (str == "c") {
return MyEnum::C;
}
return std::nullopt;
}
};
class EvenInt {
public:
EvenInt() = default;
EvenInt(int64_t value)
: value_(value)
{
assert(value % 2 == 0);
}
int64_t value() const
{
return value_;
}
private:
int64_t value_;
};
template <>
struct clipp::Value<EvenInt> {
static constexpr std::string_view typeName = "even integer";
static std::optional<EvenInt> parse(std::string_view str)
{
const auto val = clipp::Value<int64_t>::parse(str);
if (!val || val.value() % 2 != 0) {
return std::nullopt;
}
return val.value();
}
};
class ExistingFile {
public:
ExistingFile() = default;
ExistingFile(std::string path)
: path_(std::move(path))
{
// If this was real code, I would be worried about race-conditions
assert(std::filesystem::exists(path_));
}
const std::string& path() const
{
return path_;
}
private:
std::string path_;
};
template <>
struct clipp::Value<ExistingFile> {
static constexpr std::string_view typeName = "existing file";
static std::optional<ExistingFile> parse(std::string_view str)
{
if (!std::filesystem::exists(str)) {
return std::nullopt;
}
return std::string(str);
}
};
struct Args : public clipp::ArgsBase {
MyEnum myEnum;
EvenInt evenInt;
ExistingFile existingFile;
void args()
{
// Parsing will fail even without specifying `choices` here, but if you do, the error
// message will tell you what strings are allowed.
positional(myEnum, "enum").choices({ "a", "b", "c" });
positional(evenInt, "even");
positional(existingFile, "file");
}
};
int main(int argc, char** argv)
{
auto parser = clipp::Parser(argv[0]);
const auto args = parser.parse<Args>(argc, argv).value();
std::cout << "enum: " << static_cast<int>(args.myEnum) << std::endl;
std::cout << "even int: " << args.evenInt.value() << std::endl;
std::cout << "file: " << args.existingFile.path() << std::endl;
return 0;
}