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better prepare for later wide-char argparse support

master
Daniel Kolesa 2017-06-05 18:57:40 +02:00
parent 53f8a4e866
commit a414ec7544
1 changed files with 15 additions and 7 deletions
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22
ostd/argparse.hh
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@ -50,16 +50,24 @@ struct arg_error: std::runtime_error {
{}
};
/** @brief The range type passed to argument action callbacks.
/** @brief A contiguous range type used for argument values.
*
* The `T` template argument is a character type. Usually it will be
* just `char` but you might want to do UTF-16 or UTF-32 input. The
* actual range type is an ostd::contiguous_range_tag and contains
* `const` ostd::basic_char_range with `T const` and the traits type
* which is std::char_traits for `T` by default.
* This range type has immutable contents and doesn't own its memory. It
* is represented as a regular string slice with the appropraite character
* and traits types. The `T` template type is a character type, usually
* a `char` but can be `wchar_t`, `char16_t`, `char32_t` as well. The
* `TR` template type is the traits type, by default std::char_traits
* for `T`.
*/
template<typename T, typename TR = std::char_traits<T>>
using arg_value_range = iterator_range<basic_char_range<T const, TR> const *>;
using arg_value_type = basic_char_range<T const, TR>;
/** @brief The range type passed to argument action callbacks.
*
* It's a contiguous range of `const` ostd::arg_value_type.
*/
template<typename T, typename TR = std::char_traits<T>>
using arg_value_range = iterator_range<arg_value_type<T, TR> const *>;
/** @brief The type of an argument class. */
enum class arg_type {