A representation of the Spanner NUMERIC type: an exact decimal value with a maximum integer precision (kIntPrecision) and rounding to a maximum fractional precision (kFracPrecision).
A Decimal can be constructed from, and converted to a std::string, a double, or any integral type. See the MakeDecimal() factory functions, the ToString() member function, and the ToDouble()/ToInteger() free functions.
Decimal values can be copied/assigned/moved, compared for equality, and streamed.
Example
auto d = spanner::MakeDecimal<spanner::DecimalMode::kGoogleSQL>(42).value();
assert(d.ToString() == "42");
assert(spanner::ToInteger<int>(d).value() == 42);
Constructors
Decimal(Decimal &&)
Regular value type, supporting copy, assign, move.
| Parameter | |
|---|---|
| Name | Description |
|
Decimal &&
|
Decimal(Decimal const &)
Regular value type, supporting copy, assign, move.
| Parameter | |
|---|---|
| Name | Description |
|
Decimal const &
|
Decimal()
A zero value.
Operators
operator=(Decimal &&)
Regular value type, supporting copy, assign, move.
| Parameter | |
|---|---|
| Name | Description |
|
Decimal &&
|
| Returns | |
|---|---|
| Type | Description |
Decimal & |
|
operator=(Decimal const &)
Regular value type, supporting copy, assign, move.
| Parameter | |
|---|---|
| Name | Description |
|
Decimal const &
|
| Returns | |
|---|---|
| Type | Description |
Decimal & |
|
Functions
ToString() const &
Conversion to a decimal-string representation of the Decimal in one of the following forms:
- 0 // value == 0
- -?0.[0-9]*[1-9] // 0 < abs(value) < 1
- -?[1-9][0-9](.[0-9][1-9])? // abs(value) >= 1
- NaN // "not a number" for kPostgreSQL mode
Note: The string never includes an exponent field.
| Returns | |
|---|---|
| Type | Description |
std::string const & |
|
ToString() &&
Conversion to a decimal-string representation of the Decimal in one of the following forms:
- 0 // value == 0
- -?0.[0-9]*[1-9] // 0 < abs(value) < 1
- -?[1-9][0-9](.[0-9][1-9])? // abs(value) >= 1
- NaN // "not a number" for kPostgreSQL mode
Note: The string never includes an exponent field.
| Returns | |
|---|---|
| Type | Description |
std::string && |
|