File size: 1,704 Bytes
d1be154 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 | #ifndef OT_TRAITS_HPP_
#define OT_TRAITS_HPP_
#include <functional>
#include <tuple>
#include <utility>
#include <string>
#include <vector>
#include <list>
#include <forward_list>
#include <queue>
#include <stack>
#include <type_traits>
#include <memory>
#include <map>
#include <set>
#include <chrono>
#include <any>
#include <unordered_map>
#include <unordered_set>
#include <optional>
//-------------------------------------------------------------------------------------------------
// Functors.
//-------------------------------------------------------------------------------------------------
// Overloadded.
template <typename... Ts>
struct Functors : Ts... {
using Ts::operator()... ;
};
template <typename... Ts>
Functors(Ts...) -> Functors<Ts...>;
//-------------------------------------------------------------------------------------------------
// Optional
//-------------------------------------------------------------------------------------------------
// Composition of optional object.
template <typename T>
struct add_optionality {
using type = std::optional<T>;
};
template <typename T>
struct add_optionality < std::optional<T> > {
using type = std::optional<T>;
};
template <>
struct add_optionality <void> {
using type = void;
};
template <typename T>
using add_optionality_t = typename add_optionality<T>::type;
template <typename T, typename L>
auto operator | (std::optional<T>& opt, L&& lambda) -> add_optionality_t<decltype(lambda(*opt))> {
if constexpr (std::is_same_v<void, decltype(lambda(*opt))>) {
if(opt) {
lambda(*opt);
}
}
else {
if(opt) {
return lambda(*opt);
}
else {
return {};
}
}
}
#endif
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