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[Groonga-commit] groonga/grnxx at 550ce17 [master] Add a candidate of new Bool and Int.

susumu.yata null+****@clear*****
Wed Oct 22 18:16:13 JST 2014

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susumu.yata	2014-10-22 18:16:13 +0900 (Wed, 22 Oct 2014)

  New Revision: 550ce172188db8207acbd9bc40fd810fc9efc683
  https://github.com/groonga/grnxx/commit/550ce172188db8207acbd9bc40fd810fc9efc683

  Message:
    Add a candidate of new Bool and Int.

  Added files:
    include/grnxx/new_types/bool.hpp
    include/grnxx/new_types/int.hpp
    include/grnxx/new_types/na.hpp

  Added: include/grnxx/new_types/bool.hpp (+109 -0) 100644
===================================================================
--- /dev/null
+++ include/grnxx/new_types/bool.hpp    2014-10-22 18:16:13 +0900 (141a92b)
@@ -0,0 +1,109 @@
+#ifndef GRNXX_NEW_TYPES_BOOL_HPP
+#define GRNXX_NEW_TYPES_BOOL_HPP
+
+#include <cstdint>
+
+#include "grnxx/new_types/na.hpp"
+
+namespace grnxx {
+
+class Bool {
+ public:
+  Bool() = default;
+  ~Bool() = default;
+
+  constexpr Bool(const Bool &) = default;
+  Bool &operator=(const Bool &) & = default;
+
+  explicit constexpr Bool(bool value) : value_(value) {}
+  explicit constexpr Bool(NA) : value_(na_value()) {}
+
+  constexpr uint8_t value() const {
+    return value_;
+  }
+
+  constexpr bool is_true() const {
+    return value_ == true_value();
+  }
+  constexpr bool is_false() const {
+    return value_ == false_value();
+  }
+  constexpr bool is_na() const {
+    return value_ == na_value();
+  }
+
+  explicit constexpr operator bool() const {
+    return is_true();
+  }
+
+  // -- Unary operators --
+
+  constexpr Bool operator!() const {
+    return is_na() ? na() : Bool(!value_);
+  }
+  constexpr Bool operator~() const {
+    return operator!();
+  }
+
+  // -- Binary operators --
+
+  // TODO: Difficult branch predictions (for is_false()) should be removed.
+  constexpr Bool operator&&(Bool rhs) const {
+    return (is_false() || rhs.is_false()) ? Bool(false) :
+           ((is_na() || rhs.is_na()) ? na() : Bool(true));
+  }
+  constexpr Bool operator||(Bool rhs) const {
+    return (is_true() || rhs.is_true()) ? Bool(true) :
+           ((is_na() || rhs.is_na()) ? na() : Bool(false));
+  }
+
+  constexpr Bool operator&(Bool rhs) const {
+    return operator&&(rhs);
+  }
+  constexpr Bool operator|(Bool rhs) const {
+    return operator||(rhs);
+  }
+  constexpr Bool operator^(Bool rhs) const {
+    return (is_na() || rhs.is_na()) ? na() : Bool(value_ ^ rhs.value_);
+  }
+
+  Bool &operator&=(Bool rhs) & {
+    return *this = operator&(rhs);
+  }
+  Bool operator|=(Bool rhs) & {
+    return *this = operator|(rhs);
+  }
+  Bool operator^=(Bool rhs) & {
+    return *this = operator^(rhs);
+  }
+
+  // -- Comparison operators --
+
+  constexpr Bool operator==(Bool rhs) const {
+    return (is_na() || rhs.is_na()) ? na() : Bool(value_ == rhs.value_);
+  }
+  constexpr Bool operator!=(Bool rhs) const {
+    return (is_na() || rhs.is_na()) ? na() : Bool(value_ != rhs.value_);
+  }
+
+  static constexpr Bool na() {
+    return Bool(NA());
+  }
+
+  static constexpr uint8_t true_value() {
+    return 1;
+  }
+  static constexpr uint8_t false_value() {
+    return 0;
+  }
+  static constexpr uint8_t na_value() {
+    return 2;
+  }
+
+ private:
+  uint8_t value_;
+};
+
+}  // namespace grnxx
+
+#endif  // GRNXX_NEW_TYPES_BOOL_HPP

  Added: include/grnxx/new_types/int.hpp (+149 -0) 100644
===================================================================
--- /dev/null
+++ include/grnxx/new_types/int.hpp    2014-10-22 18:16:13 +0900 (fb0c658)
@@ -0,0 +1,149 @@
+#ifndef GRNXX_NEW_TYPES_INT_HPP
+#define GRNXX_NEW_TYPES_INT_HPP
+
+#include <cstdint>
+#include <limits>
+
+#include "grnxx/new_types/na.hpp"
+
+namespace grnxx {
+
+class Int {
+ public:
+  Int() = default;
+  ~Int() = default;
+
+  constexpr Int(const Int &) = default;
+  Int &operator=(const Int &) = default;
+
+  explicit constexpr Int(int64_t value) : value_(value) {}
+  explicit constexpr Int(NA) : value_(na_value()) {}
+
+  constexpr int64_t value() const {
+    return value_;
+  }
+
+  constexpr bool is_min() const {
+    return value_ == min_value();
+  }
+  constexpr bool is_max() const {
+    return value_ == max_value();
+  }
+  constexpr bool is_na() const {
+    return value_ == na_value();
+  }
+
+  // -- Unary operators --
+
+  constexpr Int operator+() const {
+    return *this;
+  }
+  constexpr Int operator-() const {
+    return is_na() ? na() : Int(-value_);
+  }
+  constexpr Int operator~() const {
+    return is_na() ? na() : Int(~value_);
+  }
+
+  Int &operator++() & {
+    if (!is_na()) {
+      ++value_;
+    }
+    return *this;
+  }
+  Int operator++(int) & {
+    if (is_na()) {
+      return na();
+    }
+    return Int(value_++);
+  }
+  Int &operator--() & {
+    if (!is_na()) {
+      --value_;
+    }
+    return *this;
+  }
+  Int operator--(int) & {
+    if (is_na()) {
+      return na();
+    }
+    return Int(value_--);
+  }
+
+  // -- Binary operators --
+
+  constexpr Int operator&(Int rhs) const {
+    return (is_na() || rhs.is_na()) ? na() : Int(value_ & rhs.value_);
+  }
+  constexpr Int operator|(Int rhs) const {
+    return (is_na() || rhs.is_na()) ? na() : Int(value_ | rhs.value_);
+  }
+  constexpr Int operator^(Int rhs) const {
+    return (is_na() || rhs.is_na()) ? na() : Int(value_ ^ rhs.value_);
+  }
+
+  Int &operator&=(Int rhs) & {
+    if (!is_na()) {
+      value_ = rhs.is_na() ? na_value() : (value_ & rhs.value_);
+    }
+    return *this;
+  }
+  Int &operator|=(Int rhs) & {
+    if (!is_na()) {
+      value_ = rhs.is_na() ? na_value() : (value_ | rhs.value_);
+    }
+    return *this;
+  }
+  Int &operator^=(Int rhs) & {
+    if (!is_na()) {
+      value_ = rhs.is_na() ? na_value() : (value_ ^ rhs.value_);
+    }
+    return *this;
+  }
+
+  // TODO: Bitwise shift operators.
+
+  // TODO: Arithmetic operators.
+
+  // -- Comparison operators --
+
+  constexpr Bool operator==(Int rhs) const {
+    return (is_na() || rhs.is_na()) ? Bool::na() : Bool(value_ == rhs.value_);
+  }
+  constexpr Bool operator!=(Int rhs) const {
+    return (is_na() || rhs.is_na()) ? Bool::na() : Bool(value_ != rhs.value_);
+  }
+  constexpr Bool operator<(Int rhs) const {
+    return (is_na() || rhs.is_na()) ? Bool::na() : Bool(value_ < rhs.value_);
+  }
+  constexpr Bool operator>(Int rhs) const {
+    return (is_na() || rhs.is_na()) ? Bool::na() : Bool(value_ > rhs.value_);
+  }
+  constexpr Bool operator<=(Int rhs) const {
+    return (is_na() || rhs.is_na()) ? Bool::na() : Bool(value_ <= rhs.value_);
+  }
+  constexpr Bool operator>=(Int rhs) const {
+    return (is_na() || rhs.is_na()) ? Bool::na() : Bool(value_ >= rhs.value_);
+  }
+
+  static constexpr Int na() {
+    return Int(NA());
+  }
+
+  static constexpr int64_t min_value() {
+    return std::numeric_limits<int64_t>::min() + 1;
+  }
+  static constexpr int64_t max_value() {
+    return std::numeric_limits<int64_t>::max();
+  }
+  static constexpr int64_t na_value() {
+    return std::numeric_limits<int64_t>::min();
+  }
+
+ private:
+  int64_t value_;
+};
+
+}  // namespace grnxx
+
+#endif  // GRNXX_NEW_TYPES_INT_HPP

  Added: include/grnxx/new_types/na.hpp (+10 -0) 100644
===================================================================
--- /dev/null
+++ include/grnxx/new_types/na.hpp    2014-10-22 18:16:13 +0900 (bb324e8)
@@ -0,0 +1,10 @@
+#ifndef GRNXX_NEW_TYPES_NA_HPP
+#define GRNXX_NEW_TYPES_NA_HPP
+
+namespace grnxx {
+
+class NA {};
+
+}  // namespace grnxx
+
+#endif  // GRNXX_NEW_TYPES_NA_HPP
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