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Embed verification logic in applicator::apply.

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This commit is contained in:
RonxBulld 2021-04-26 15:39:49 +08:00
parent e6d0b30f37
commit d094fdfab0
1 changed files with 35 additions and 10 deletions
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27
proposals-demo/objectification/main.cpp
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@ -31,6 +31,7 @@ void ApplyAction(Obj &O, const Action & action, const Actions & ... actions)
} }
//=========================================================================== //===========================================================================
// Option
struct Opt : public cxxopts::Option struct Opt : public cxxopts::Option
{ {
@ -49,6 +50,9 @@ struct Opt : public cxxopts::Option
}; };
//===========================================================================
// Parser
struct Parser : public cxxopts::Options struct Parser : public cxxopts::Options
{ {
template <typename ... Actions> template <typename ... Actions>
@ -66,10 +70,26 @@ struct Parser : public cxxopts::Options
} }
}; };
//===========================================================================
// Exception
class option_multiset_error : public cxxopts::OptionSpecException
{
public:
explicit option_multiset_error(const std::string& option)
: OptionSpecException("Option " +
cxxopts::LQUOTE + option + cxxopts::RQUOTE +
" is set multiple times.")
{
}
};
} }
namespace yaco /// Applicators - the instance properties implicit modifier. namespace yaco /// Applicators - the instance properties implicit modifier.
{ {
template <unsigned N> struct applicator <char[N]> template <unsigned N> struct applicator <char[N]>
{ {
static void apply(const char *str, Parser &Os) static void apply(const char *str, Parser &Os)
@ -79,6 +99,11 @@ namespace yaco /// Applicators - the instance properties implicit modifier.
static void apply(const char *str, Opt &O) static void apply(const char *str, Opt &O)
{ {
if (!O.opts_.empty())
{
cxxopts::throw_or_mimic<option_multiset_error>
(std::string(str) + " (previous: " + O.opts_ + ")");
}
O.opts_ = std::string(str); O.opts_ = std::string(str);
} }
}; };
@ -117,7 +142,7 @@ namespace yaco /// The instance properties explicit modifier.
yaco::Parser options("objectification-demo"); yaco::Parser options("objectification-demo");
yaco::Opt help("h,help", yaco::desc("display help messages."), yaco::inject(options)); yaco::Opt help("h,help", yaco::desc("display help messages."), yaco::inject(options));
yaco::Opt job("j,job", "jobs", yaco::type<int>(), yaco::inject(options)); yaco::Opt job("j", yaco::desc("jobs"), yaco::type<int>(), yaco::inject(options));
int main(int argc, char **argv) { int main(int argc, char **argv) {
auto result = options.parse(argc, argv); auto result = options.parse(argc, argv);