133 lines
3.8 KiB
C++
133 lines
3.8 KiB
C++
#pragma once
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#include <cstdint>
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#include <string>
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#include <string_view>
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#include <optional>
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#include <type_traits>
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#include <cassert>
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// TODO: use pack(16) instead to guarantie same size on 32bit and 64bit?
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#pragma pack(1)
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struct CM_InternalStringView final {
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const char* start {nullptr};
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uint64_t extend {0};
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// conversion helpers
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CM_InternalStringView(const std::string_view sv) : start(sv.data()), extend(sv.size()) {}
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template<std::size_t N>
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CM_InternalStringView(const char (&str)[N]) : start(str), extend(N-1u) {}
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CM_InternalStringView(const std::string& str) : start(str.data()), extend(str.size()) {}
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operator std::string() { return {start, start+extend}; }
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operator std::string_view() { return {start, size_t(extend)}; }
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};
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static_assert(sizeof(CM_InternalStringView) == sizeof(const char*) + sizeof(uint64_t), "guarantee abi (hope)");
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using CM_ISV = CM_InternalStringView;
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#pragma pack() // undo pack(1)
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template<typename T>
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struct CM_InternalOptional {
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bool has_value {false};
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union {
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bool b;
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int64_t i;
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double d;
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CM_InternalStringView s;
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};
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void set(bool v) { has_value = true; b = v; }
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void set(int64_t v) { has_value = true; i = v; }
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void set(double v) { has_value = true; d = v; }
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void set(CM_InternalStringView v) { has_value = true; s = v; }
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CM_InternalOptional(T v) : CM_InternalOptional(std::optional<T>{v}) {} // HACK: route through conv
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// conversion helpers
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CM_InternalOptional(std::nullopt_t) : has_value(false) {}
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CM_InternalOptional(std::optional<bool> opt) : has_value(opt.has_value()) { if (opt.has_value()) set(opt.value()); }
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CM_InternalOptional(std::optional<int64_t> opt) : has_value(opt.has_value()) { if (opt.has_value()) set(opt.value()); }
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CM_InternalOptional(std::optional<double> opt) : has_value(opt.has_value()) { if (opt.has_value()) set(opt.value()); }
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CM_InternalOptional(std::optional<CM_InternalStringView> opt) : has_value(opt.has_value()) { if (opt.has_value()) set(opt.value()); }
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//operator std::optional<T>(void) const = delete;
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operator auto() const {
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if (has_value) {
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if constexpr (std::is_same_v<T, bool>) {
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return std::optional{b};
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} else if constexpr (std::is_same_v<T, int64_t>) {
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return std::optional{i};
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} else if constexpr (std::is_same_v<T, double>) {
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return std::optional{d};
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} else if constexpr (std::is_same_v<T, CM_InternalStringView>) {
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return std::optional{s};
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}
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}
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return std::optional<T>{};
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}
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T value(void) {
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assert(has_value); // use exceptions instead?
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if constexpr (std::is_same_v<T, bool>) {
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return b;
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} else if constexpr (std::is_same_v<T, int64_t>) {
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return i;
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} else if constexpr (std::is_same_v<T, double>) {
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return d;
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} else if constexpr (std::is_same_v<T, CM_InternalStringView>) {
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return s;
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}
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}
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T& value_or(T& other) {
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if (has_value) {
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if constexpr (std::is_same_v<T, bool>) {
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return b;
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} else if constexpr (std::is_same_v<T, int64_t>) {
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return i;
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} else if constexpr (std::is_same_v<T, double>) {
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return d;
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} else if constexpr (std::is_same_v<T, CM_InternalStringView>) {
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return s;
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}
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} else {
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return other;
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}
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}
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const T& value_or(const T& other) const {
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if (has_value) {
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if constexpr (std::is_same_v<T, bool>) {
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return b;
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} else if constexpr (std::is_same_v<T, int64_t>) {
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return i;
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} else if constexpr (std::is_same_v<T, double>) {
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return d;
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} else if constexpr (std::is_same_v<T, CM_InternalStringView>) {
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return s;
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}
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} else {
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return other;
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}
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}
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T value_or(T&& other) {
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if (has_value) {
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if constexpr (std::is_same_v<T, bool>) {
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return b;
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} else if constexpr (std::is_same_v<T, int64_t>) {
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return i;
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} else if constexpr (std::is_same_v<T, double>) {
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return d;
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} else if constexpr (std::is_same_v<T, CM_InternalStringView>) {
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return s;
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}
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} else {
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return other;
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}
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}
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};
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