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Add _a literal for named arguments

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This commit is contained in:
Dean Moldovan
2016-06-03 10:00:40 +02:00
parent f600c1d899
commit 96017dd7cd
4 changed files with 27 additions and 8 deletions
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20
include/pybind11/attr.h
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@@ -18,23 +18,29 @@ template <typename T> struct arg_t;
/// Annotation for keyword arguments
struct arg {
arg(const char *name) : name(name) { }
template <typename T> arg_t<T> operator=(const T &value);
template <typename T, size_t N> arg_t<const T *> operator=(T const (&value)[N]);
constexpr arg(const char *name) : name(name) { }
template <typename T>
constexpr arg_t<T> operator=(const T &value) const { return {name, value}; }
template <typename T, size_t N>
constexpr arg_t<const T *> operator=(T const (&value)[N]) const {
return operator=((const T *) value);
};
const char *name;
};
/// Annotation for keyword arguments with default values
template <typename T> struct arg_t : public arg {
arg_t(const char *name, const T &value, const char *descr = nullptr)
constexpr arg_t(const char *name, const T &value, const char *descr = nullptr)
: arg(name), value(value), descr(descr) { }
T value;
const char *descr;
};
template <typename T> arg_t<T> arg::operator=(const T &value) { return arg_t<T>(name, value); }
template <typename T, size_t N> arg_t<const T *> arg::operator=(T const (&value)[N]) {
return operator=((const T *) value);
inline namespace literals {
/// String literal version of arg
constexpr arg operator"" _a(const char *name, size_t) { return {name}; }
}
/// Annotation for methods