| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| **/ |
| |
| #ifndef QUICKSTEP_TYPES_DOUBLE_TYPE_HPP_ |
| #define QUICKSTEP_TYPES_DOUBLE_TYPE_HPP_ |
| |
| #include <cstdio> |
| #include <limits> |
| #include <string> |
| |
| #include "types/NumericSuperType.hpp" |
| #include "types/TypeID.hpp" |
| #include "types/TypedValue.hpp" |
| #include "utility/Macros.hpp" |
| |
| namespace quickstep { |
| |
| class Type; |
| |
| /** \addtogroup Types |
| * @{ |
| */ |
| |
| /** |
| * @brief A type representing a double-precision floating-point number. |
| **/ |
| class DoubleType : public NumericSuperType<double> { |
| public: |
| static const TypeID kStaticTypeID; |
| |
| /** |
| * @brief Get a reference to the non-nullable singleton instance of this |
| * Type. |
| * |
| * @return A reference to the non-nullable singleton instance of this Type. |
| **/ |
| static const DoubleType& InstanceNonNullable() { |
| static DoubleType instance(false); |
| return instance; |
| } |
| |
| /** |
| * @brief Get a reference to the nullable singleton instance of this Type. |
| * |
| * @return A reference to the nullable singleton instance of this Type. |
| **/ |
| static const DoubleType& InstanceNullable() { |
| static DoubleType instance(true); |
| return instance; |
| } |
| |
| /** |
| * @brief Get a reference to a singleton instance of this Type. |
| * |
| * @param nullable Whether to get the nullable version of this Type. |
| * @return A reference to the desired singleton instance of this Type. |
| **/ |
| static const DoubleType& Instance(const bool nullable) { |
| if (nullable) { |
| return InstanceNullable(); |
| } else { |
| return InstanceNonNullable(); |
| } |
| } |
| |
| const Type& getNullableVersion() const override { |
| return InstanceNullable(); |
| } |
| |
| const Type& getNonNullableVersion() const override { |
| return InstanceNonNullable(); |
| } |
| |
| bool isSafelyCoercibleFrom(const Type &original_type) const override; |
| |
| int getPrintWidth() const override { |
| return kPrintWidth; |
| } |
| |
| std::string printValueToString(const TypedValue &value) const override; |
| |
| void printValueToFile(const TypedValue &value, |
| FILE *file, |
| const int padding = 0) const override; |
| |
| bool parseValueFromString(const std::string &value_string, |
| TypedValue *value) const override; |
| |
| TypedValue coerceValue(const TypedValue &original_value, |
| const Type &original_type) const override; |
| |
| private: |
| static_assert((std::numeric_limits<double>::max_exponent10 < 1000) |
| && (std::numeric_limits<double>::min_exponent10 > -1000), |
| "Exponent range for double can not be represented with 3 " |
| "decimal digits."); |
| |
| static constexpr int kPrintWidth |
| = std::numeric_limits<double>::max_digits10 // Maximum mantissa digits |
| + 1 // Decimal point '.' |
| + 1 // Minus sign '-' |
| + 2 // Exponent signifier 'e' and sign '+' or '-' |
| + 3; // Maximum exponent digits. Range of normalized base-10 exponents |
| // for 64-bit double is -308 to +308. Smallest denormalized |
| // exponent is -324. The static_assert above ensures that the |
| // exponent never takes more than 3 base-10 digits to represent. |
| |
| explicit DoubleType(const bool nullable) |
| : NumericSuperType<double>(kDouble, nullable) { |
| } |
| |
| DISALLOW_COPY_AND_ASSIGN(DoubleType); |
| }; |
| |
| /** @} */ |
| |
| } // namespace quickstep |
| |
| #endif // QUICKSTEP_TYPES_DOUBLE_TYPE_HPP_ |