operator -= { associativity right precedence assignment } Declarations func -=(_: inout Double, rhs: Double) Subtracts the second value from the first and stores the difference in the left-hand-side variable, rounding to a representable value. Parameters: lhs: A numeric value. rhs: The value to subtract from lhs. Declaration func -=(lhs: inout Double, rhs: Double) func -=(_: inout Float, rhs: Float) Subtracts the second value from the first and stores the difference in the left-hand-side variable, rounding to a representable value. Parameters: lhs: A numeric value. rhs: The value to subtract from lhs. Declaration func -=(lhs: inout Float, rhs: Float) func -=(_: inout Float80, rhs: Float80) Subtracts the second value from the first and stores the difference in the left-hand-side variable, rounding to a representable value. Parameters: lhs: A numeric value. rhs: The value to subtract from lhs. Declaration func -=(lhs: inout Float80, rhs: Float80) Declared In Float80, BinaryFloatingPoint, Strideable func -=(_: inout Int, rhs: Int) Subtracts the second value from the first and stores the difference in the left-hand-side variable. The difference of the two arguments must be representable in the arguments' type. In the following example, the result of 21 - 50 is less than zero, the minimum representable UInt8 value: var x: UInt8 = 21 x - 50 // Overflow error Note: Overflow checking is not performed in -Ounchecked builds. Parameters: lhs: A numeric value. rhs: The value to subtract from lhs. Declaration func -=(lhs: inout Int, rhs: Int) Declared In Int, FixedWidthInteger func -=(_: inout Int8, rhs: Int8) Subtracts the second value from the first and stores the difference in the left-hand-side variable. The difference of the two arguments must be representable in the arguments' type. In the following example, the result of 21 - 50 is less than zero, the minimum representable UInt8 value: var x: UInt8 = 21 x - 50 // Overflow error Note: Overflow checking is not performed in -Ounchecked builds. Parameters: lhs: A numeric value. rhs: The value to subtract from lhs. Declaration func -=(lhs: inout Int8, rhs: Int8) Declared In Int8, FixedWidthInteger func -=(_: inout Int16, rhs: Int16) Subtracts the second value from the first and stores the difference in the left-hand-side variable. The difference of the two arguments must be representable in the arguments' type. In the following example, the result of 21 - 50 is less than zero, the minimum representable UInt8 value: var x: UInt8 = 21 x - 50 // Overflow error Note: Overflow checking is not performed in -Ounchecked builds. Parameters: lhs: A numeric value. rhs: The value to subtract from lhs. Declaration func -=(lhs: inout Int16, rhs: Int16) Declared In Int16, FixedWidthInteger func -=(_: inout Int32, rhs: Int32) Subtracts the second value from the first and stores the difference in the left-hand-side variable. The difference of the two arguments must be representable in the arguments' type. In the following example, the result of 21 - 50 is less than zero, the minimum representable UInt8 value: var x: UInt8 = 21 x - 50 // Overflow error Note: Overflow checking is not performed in -Ounchecked builds. Parameters: lhs: A numeric value. rhs: The value to subtract from lhs. Declaration func -=(lhs: inout Int32, rhs: Int32) Declared In Int32, FixedWidthInteger func -=(_: inout Int64, rhs: Int64) Subtracts the second value from the first and stores the difference in the left-hand-side variable. The difference of the two arguments must be representable in the arguments' type. In the following example, the result of 21 - 50 is less than zero, the minimum representable UInt8 value: var x: UInt8 = 21 x - 50 // Overflow error Note: Overflow checking is not performed in -Ounchecked builds. Parameters: lhs: A numeric value. rhs: The value to subtract from lhs. Declaration func -=(lhs: inout Int64, rhs: Int64) Declared In Int64, FixedWidthInteger func -=(_: inout Self, rhs: Self.Stride) Declaration func -=(lhs: inout Self, rhs: Self.Stride) Declared In Strideable func -=(_: inout Self, rhs: Self.Stride) Declaration func -=(lhs: inout Self, rhs: Self.Stride) Declared In Strideable func -=(_: inout Self, rhs: Self.Stride) Declaration func -=(lhs: inout Self, rhs: Self.Stride) Declared In Strideable func -=(_: inout Self, rhs: Self.Stride) Declaration func -=(lhs: inout Self, rhs: Self.Stride) Declared In Strideable func -=(_: inout Self, rhs: Self.Stride) Declaration func -=(lhs: inout Self, rhs: Self.Stride) Declared In Strideable func -=(_: inout UInt, rhs: UInt) Subtracts the second value from the first and stores the difference in the left-hand-side variable. The difference of the two arguments must be representable in the arguments' type. In the following example, the result of 21 - 50 is less than zero, the minimum representable UInt8 value: var x: UInt8 = 21 x - 50 // Overflow error Note: Overflow checking is not performed in -Ounchecked builds. Parameters: lhs: A numeric value. rhs: The value to subtract from lhs. Declaration func -=(lhs: inout UInt, rhs: UInt) Declared In UInt, FixedWidthInteger func -=(_: inout UInt8, rhs: UInt8) Subtracts the second value from the first and stores the difference in the left-hand-side variable. The difference of the two arguments must be representable in the arguments' type. In the following example, the result of 21 - 50 is less than zero, the minimum representable UInt8 value: var x: UInt8 = 21 x - 50 // Overflow error Note: Overflow checking is not performed in -Ounchecked builds. Parameters: lhs: A numeric value. rhs: The value to subtract from lhs. Declaration func -=(lhs: inout UInt8, rhs: UInt8) Declared In UInt8, FixedWidthInteger func -=(_: inout UInt16, rhs: UInt16) Subtracts the second value from the first and stores the difference in the left-hand-side variable. The difference of the two arguments must be representable in the arguments' type. In the following example, the result of 21 - 50 is less than zero, the minimum representable UInt8 value: var x: UInt8 = 21 x - 50 // Overflow error Note: Overflow checking is not performed in -Ounchecked builds. Parameters: lhs: A numeric value. rhs: The value to subtract from lhs. Declaration func -=(lhs: inout UInt16, rhs: UInt16) Declared In UInt16, FixedWidthInteger func -=(_: inout UInt32, rhs: UInt32) Subtracts the second value from the first and stores the difference in the left-hand-side variable. The difference of the two arguments must be representable in the arguments' type. In the following example, the result of 21 - 50 is less than zero, the minimum representable UInt8 value: var x: UInt8 = 21 x - 50 // Overflow error Note: Overflow checking is not performed in -Ounchecked builds. Parameters: lhs: A numeric value. rhs: The value to subtract from lhs. Declaration func -=(lhs: inout UInt32, rhs: UInt32) Declared In UInt32, FixedWidthInteger func -=(_: inout UInt64, rhs: UInt64) Subtracts the second value from the first and stores the difference in the left-hand-side variable. The difference of the two arguments must be representable in the arguments' type. In the following example, the result of 21 - 50 is less than zero, the minimum representable UInt8 value: var x: UInt8 = 21 x - 50 // Overflow error Note: Overflow checking is not performed in -Ounchecked builds. Parameters: lhs: A numeric value. rhs: The value to subtract from lhs. Declaration func -=(lhs: inout UInt64, rhs: UInt64) Declared In UInt64, FixedWidthInteger