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common: implement dependent option descriptor

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This commit is contained in:
whythat 2018-01-21 17:28:32 +02:00
parent ef91d6e61e
commit c33cb60eb6
1 changed files with 45 additions and 5 deletions
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50
src/common/command_line.h
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@ -46,7 +46,7 @@ namespace command_line
//! \return True if `str` is `is_iequal("n" || "no" || `tr("no"))`.
bool is_no(const std::string& str);
template<typename T, bool required = false>
template<typename T, bool required = false, bool dependent = false>
struct arg_descriptor;
template<typename T>
@ -80,6 +80,22 @@ namespace command_line
const char* description;
};
template<typename T>
struct arg_descriptor<T, false, true>
{
typedef T value_type;
const char* name;
const char* description;
const arg_descriptor<bool, false>& ref;
T true_default_value;
T false_default_value;
bool not_use_default;
};
template<typename T>
boost::program_options::typed_value<T, char>* make_semantic(const arg_descriptor<T, true>& /*arg*/)
{
@ -95,6 +111,23 @@ namespace command_line
return semantic;
}
template<typename T>
boost::program_options::typed_value<T, char>* make_semantic(const arg_descriptor<T, false, true>& arg)
{
auto semantic = boost::program_options::value<T>();
if (!arg.not_use_default) {
if (arg.ref.default_value)
{
semantic->default_value(arg.true_default_value);
}
else
{
semantic->default_value(arg.false_default_value);
}
}
return semantic;
}
template<typename T>
boost::program_options::typed_value<T, char>* make_semantic(const arg_descriptor<T, false>& arg, const T& def)
{
@ -112,8 +145,8 @@ namespace command_line
return semantic;
}
template<typename T, bool required>
void add_arg(boost::program_options::options_description& description, const arg_descriptor<T, required>& arg, bool unique = true)
template<typename T, bool required, bool dependent>
void add_arg(boost::program_options::options_description& description, const arg_descriptor<T, required, dependent>& arg, bool unique = true)
{
if (0 != description.find_nothrow(arg.name, false))
{
@ -189,12 +222,19 @@ namespace command_line
return !value.empty();
}
template<typename T, bool required>
bool is_arg_defaulted(const boost::program_options::variables_map& vm, const arg_descriptor<T, required>& arg)
template<typename T, bool required, bool dependent>
bool is_arg_defaulted(const boost::program_options::variables_map& vm, const arg_descriptor<T, required, dependent>& arg)
{
return vm[arg.name].defaulted();
}
template<typename T, bool required>
T get_arg(const boost::program_options::variables_map& vm, const arg_descriptor<T, required, true>& arg)
{
if (is_arg_defaulted(vm, arg) && !is_arg_defaulted(vm, arg.ref))
return get_arg(vm, arg.ref) ? arg.true_default_value : arg.false_default_value;
return vm[arg.name].template as<T>();
}
template<typename T, bool required>
T get_arg(const boost::program_options::variables_map& vm, const arg_descriptor<T, required>& arg)