Struct bill::Currency [−] [src]

pub struct Currency {
    pub symbol: Option<char>,
    pub value: i64,
}

Represents currency through an optional symbol and amount of coin.

Each 100 coins results in a banknote. (100 is formatted as 1.00) The currency will be formatted as such: Currency(Some('$'), 432) ==> "$4.32"

Fields

Currency symbol

pick any of €, £, $, ¥ etc...

value in the smallest possible unit

Methods

impl Currency
[src]

Creates a blank Currency as Currency(None, 0)

Examples

let mut c = Currency::new();

Initialize from i64

Returns an object that implements Display for different methods of printing currency.

Returns an object that implements Display for different methods of printing currency.

Returns the value as float

Warning, do not use this for calculation, this is for displaying only!

Returns the inner value

Returns the inner symbol

Methods from Deref<Target = i64>

Returns the number of ones in the binary representation of self.

Examples

Basic usage:

let n = -0b1000_0000i8;

assert_eq!(n.count_ones(), 1);

Returns the number of zeros in the binary representation of self.

Examples

Basic usage:

let n = -0b1000_0000i8;

assert_eq!(n.count_zeros(), 7);

Returns the number of leading zeros in the binary representation of self.

Examples

Basic usage:

let n = -1i16;

assert_eq!(n.leading_zeros(), 0);

Returns the number of trailing zeros in the binary representation of self.

Examples

Basic usage:

let n = -4i8;

assert_eq!(n.trailing_zeros(), 2);

Shifts the bits to the left by a specified amount, n, wrapping the truncated bits to the end of the resulting integer.

Please note this isn't the same operation as <<!

Examples

Basic usage:

let n = 0x0123456789ABCDEFi64;
let m = -0x76543210FEDCBA99i64;

assert_eq!(n.rotate_left(32), m);

Shifts the bits to the right by a specified amount, n, wrapping the truncated bits to the beginning of the resulting integer.

Please note this isn't the same operation as >>!

Examples

Basic usage:

let n = 0x0123456789ABCDEFi64;
let m = -0xFEDCBA987654322i64;

assert_eq!(n.rotate_right(4), m);

Reverses the byte order of the integer.

Examples

Basic usage:

let n =  0x0123456789ABCDEFi64;
let m = -0x1032547698BADCFFi64;

assert_eq!(n.swap_bytes(), m);

Converts self to big endian from the target's endianness.

On big endian this is a no-op. On little endian the bytes are swapped.

Examples

Basic usage:

let n = 0x0123456789ABCDEFi64;

if cfg!(target_endian = "big") {
    assert_eq!(n.to_be(), n)
} else {
    assert_eq!(n.to_be(), n.swap_bytes())
}

Converts self to little endian from the target's endianness.

On little endian this is a no-op. On big endian the bytes are swapped.

Examples

Basic usage:

let n = 0x0123456789ABCDEFi64;

if cfg!(target_endian = "little") {
    assert_eq!(n.to_le(), n)
} else {
    assert_eq!(n.to_le(), n.swap_bytes())
}

Checked integer addition. Computes self + other, returning None if overflow occurred.

Examples

Basic usage:

assert_eq!(7i16.checked_add(32760), Some(32767));
assert_eq!(8i16.checked_add(32760), None);

Checked integer subtraction. Computes self - other, returning None if underflow occurred.

Examples

Basic usage:

assert_eq!((-127i8).checked_sub(1), Some(-128));
assert_eq!((-128i8).checked_sub(1), None);

Checked integer multiplication. Computes self * other, returning None if underflow or overflow occurred.

Examples

Basic usage:

assert_eq!(6i8.checked_mul(21), Some(126));
assert_eq!(6i8.checked_mul(22), None);

Checked integer division. Computes self / other, returning None if other == 0 or the operation results in underflow or overflow.

Examples

Basic usage:

assert_eq!((-127i8).checked_div(-1), Some(127));
assert_eq!((-128i8).checked_div(-1), None);
assert_eq!((1i8).checked_div(0), None);

Checked integer remainder. Computes self % other, returning None if other == 0 or the operation results in underflow or overflow.

Examples

Basic usage:

use std::i32;

assert_eq!(5i32.checked_rem(2), Some(1));
assert_eq!(5i32.checked_rem(0), None);
assert_eq!(i32::MIN.checked_rem(-1), None);

Checked negation. Computes -self, returning None if self == MIN.

Examples

Basic usage:

use std::i32;

assert_eq!(5i32.checked_neg(), Some(-5));
assert_eq!(i32::MIN.checked_neg(), None);

Checked shift left. Computes self << rhs, returning None if rhs is larger than or equal to the number of bits in self.

Examples

Basic usage:

assert_eq!(0x10i32.checked_shl(4), Some(0x100));
assert_eq!(0x10i32.checked_shl(33), None);

Checked shift right. Computes self >> rhs, returning None if rhs is larger than or equal to the number of bits in self.

Examples

Basic usage:

assert_eq!(0x10i32.checked_shr(4), Some(0x1));
assert_eq!(0x10i32.checked_shr(33), None);

Checked absolute value. Computes self.abs(), returning None if self == MIN.

Examples

Basic usage:

use std::i32;

assert_eq!((-5i32).checked_abs(), Some(5));
assert_eq!(i32::MIN.checked_abs(), None);

Saturating integer addition. Computes self + other, saturating at the numeric bounds instead of overflowing.

Examples

Basic usage:

assert_eq!(100i8.saturating_add(1), 101);
assert_eq!(100i8.saturating_add(127), 127);

Saturating integer subtraction. Computes self - other, saturating at the numeric bounds instead of overflowing.

Examples

Basic usage:

assert_eq!(100i8.saturating_sub(127), -27);
assert_eq!((-100i8).saturating_sub(127), -128);

Saturating integer multiplication. Computes self * other, saturating at the numeric bounds instead of overflowing.

Examples

Basic usage:

use std::i32;

assert_eq!(100i32.saturating_mul(127), 12700);
assert_eq!((1i32 << 23).saturating_mul(1 << 23), i32::MAX);
assert_eq!((-1i32 << 23).saturating_mul(1 << 23), i32::MIN);

Wrapping (modular) addition. Computes self + other, wrapping around at the boundary of the type.

Examples

Basic usage:

assert_eq!(100i8.wrapping_add(27), 127);
assert_eq!(100i8.wrapping_add(127), -29);

Wrapping (modular) subtraction. Computes self - other, wrapping around at the boundary of the type.

Examples

Basic usage:

assert_eq!(0i8.wrapping_sub(127), -127);
assert_eq!((-2i8).wrapping_sub(127), 127);

Wrapping (modular) multiplication. Computes self * other, wrapping around at the boundary of the type.

Examples

Basic usage:

assert_eq!(10i8.wrapping_mul(12), 120);
assert_eq!(11i8.wrapping_mul(12), -124);

Wrapping (modular) division. Computes self / other, wrapping around at the boundary of the type.

The only case where such wrapping can occur is when one divides MIN / -1 on a signed type (where MIN is the negative minimal value for the type); this is equivalent to -MIN, a positive value that is too large to represent in the type. In such a case, this function returns MIN itself.

Panics

This function will panic if rhs is 0.

Examples

Basic usage:

assert_eq!(100u8.wrapping_div(10), 10);
assert_eq!((-128i8).wrapping_div(-1), -128);

Wrapping (modular) remainder. Computes self % other, wrapping around at the boundary of the type.

Such wrap-around never actually occurs mathematically; implementation artifacts make x % y invalid for MIN / -1 on a signed type (where MIN is the negative minimal value). In such a case, this function returns 0.

Panics

This function will panic if rhs is 0.

Examples

Basic usage:

assert_eq!(100i8.wrapping_rem(10), 0);
assert_eq!((-128i8).wrapping_rem(-1), 0);

Wrapping (modular) negation. Computes -self, wrapping around at the boundary of the type.

The only case where such wrapping can occur is when one negates MIN on a signed type (where MIN is the negative minimal value for the type); this is a positive value that is too large to represent in the type. In such a case, this function returns MIN itself.

Examples

Basic usage:

assert_eq!(100i8.wrapping_neg(), -100);
assert_eq!((-128i8).wrapping_neg(), -128);

Panic-free bitwise shift-left; yields self << mask(rhs), where mask removes any high-order bits of rhs that would cause the shift to exceed the bitwidth of the type.

Note that this is not the same as a rotate-left; the RHS of a wrapping shift-left is restricted to the range of the type, rather than the bits shifted out of the LHS being returned to the other end. The primitive integer types all implement a rotate_left function, which may be what you want instead.

Examples

Basic usage:

assert_eq!((-1i8).wrapping_shl(7), -128);
assert_eq!((-1i8).wrapping_shl(8), -1);

Panic-free bitwise shift-right; yields self >> mask(rhs), where mask removes any high-order bits of rhs that would cause the shift to exceed the bitwidth of the type.

Note that this is not the same as a rotate-right; the RHS of a wrapping shift-right is restricted to the range of the type, rather than the bits shifted out of the LHS being returned to the other end. The primitive integer types all implement a rotate_right function, which may be what you want instead.

Examples

Basic usage:

assert_eq!((-128i8).wrapping_shr(7), -1);
assert_eq!((-128i8).wrapping_shr(8), -128);

Wrapping (modular) absolute value. Computes self.abs(), wrapping around at the boundary of the type.

The only case where such wrapping can occur is when one takes the absolute value of the negative minimal value for the type this is a positive value that is too large to represent in the type. In such a case, this function returns MIN itself.

Examples

Basic usage:

assert_eq!(100i8.wrapping_abs(), 100);
assert_eq!((-100i8).wrapping_abs(), 100);
assert_eq!((-128i8).wrapping_abs(), -128);
assert_eq!((-128i8).wrapping_abs() as u8, 128);

Calculates self + rhs

Returns a tuple of the addition along with a boolean indicating whether an arithmetic overflow would occur. If an overflow would have occurred then the wrapped value is returned.

Examples

Basic usage

use std::i32;

assert_eq!(5i32.overflowing_add(2), (7, false));
assert_eq!(i32::MAX.overflowing_add(1), (i32::MIN, true));

Calculates self - rhs

Returns a tuple of the subtraction along with a boolean indicating whether an arithmetic overflow would occur. If an overflow would have occurred then the wrapped value is returned.

Examples

Basic usage

use std::i32;

assert_eq!(5i32.overflowing_sub(2), (3, false));
assert_eq!(i32::MIN.overflowing_sub(1), (i32::MAX, true));

Calculates the multiplication of self and rhs.

Returns a tuple of the multiplication along with a boolean indicating whether an arithmetic overflow would occur. If an overflow would have occurred then the wrapped value is returned.

Examples

Basic usage

assert_eq!(5i32.overflowing_mul(2), (10, false));
assert_eq!(1_000_000_000i32.overflowing_mul(10), (1410065408, true));

Calculates the divisor when self is divided by rhs.

Returns a tuple of the divisor along with a boolean indicating whether an arithmetic overflow would occur. If an overflow would occur then self is returned.

Panics

This function will panic if rhs is 0.

Examples

Basic usage

use std::i32;

assert_eq!(5i32.overflowing_div(2), (2, false));
assert_eq!(i32::MIN.overflowing_div(-1), (i32::MIN, true));

Calculates the remainder when self is divided by rhs.

Returns a tuple of the remainder after dividing along with a boolean indicating whether an arithmetic overflow would occur. If an overflow would occur then 0 is returned.

Panics

This function will panic if rhs is 0.

Examples

Basic usage

use std::i32;

assert_eq!(5i32.overflowing_rem(2), (1, false));
assert_eq!(i32::MIN.overflowing_rem(-1), (0, true));

Negates self, overflowing if this is equal to the minimum value.

Returns a tuple of the negated version of self along with a boolean indicating whether an overflow happened. If self is the minimum value (e.g. i32::MIN for values of type i32), then the minimum value will be returned again and true will be returned for an overflow happening.

Examples

Basic usage

use std::i32;

assert_eq!(2i32.overflowing_neg(), (-2, false));
assert_eq!(i32::MIN.overflowing_neg(), (i32::MIN, true));

Shifts self left by rhs bits.

Returns a tuple of the shifted version of self along with a boolean indicating whether the shift value was larger than or equal to the number of bits. If the shift value is too large, then value is masked (N-1) where N is the number of bits, and this value is then used to perform the shift.

Examples

Basic usage

assert_eq!(0x10i32.overflowing_shl(4), (0x100, false));
assert_eq!(0x10i32.overflowing_shl(36), (0x100, true));

Shifts self right by rhs bits.

Returns a tuple of the shifted version of self along with a boolean indicating whether the shift value was larger than or equal to the number of bits. If the shift value is too large, then value is masked (N-1) where N is the number of bits, and this value is then used to perform the shift.

Examples

Basic usage

assert_eq!(0x10i32.overflowing_shr(4), (0x1, false));
assert_eq!(0x10i32.overflowing_shr(36), (0x1, true));

Computes the absolute value of self.

Returns a tuple of the absolute version of self along with a boolean indicating whether an overflow happened. If self is the minimum value (e.g. i32::MIN for values of type i32), then the minimum value will be returned again and true will be returned for an overflow happening.

Examples

Basic usage:

assert_eq!(10i8.overflowing_abs(), (10,false));
assert_eq!((-10i8).overflowing_abs(), (10,false));
assert_eq!((-128i8).overflowing_abs(), (-128,true));

Raises self to the power of exp, using exponentiation by squaring.

Examples

Basic usage:

let x: i32 = 2; // or any other integer type

assert_eq!(x.pow(4), 16);

Computes the absolute value of self.

Overflow behavior

The absolute value of i32::min_value() cannot be represented as an i32, and attempting to calculate it will cause an overflow. This means that code in debug mode will trigger a panic on this case and optimized code will return i32::min_value() without a panic.

Examples

Basic usage:

assert_eq!(10i8.abs(), 10);
assert_eq!((-10i8).abs(), 10);

Returns a number representing sign of self.

  • 0 if the number is zero
  • 1 if the number is positive
  • -1 if the number is negative

Examples

Basic usage:

assert_eq!(10i8.signum(), 1);
assert_eq!(0i8.signum(), 0);
assert_eq!((-10i8).signum(), -1);

Returns true if self is positive and false if the number is zero or negative.

Examples

Basic usage:

assert!(10i8.is_positive());
assert!(!(-10i8).is_positive());

Returns true if self is negative and false if the number is zero or positive.

Examples

Basic usage:

assert!((-10i8).is_negative());
assert!(!10i8.is_negative());

Trait Implementations

impl PartialOrd<Currency> for Currency
[src]

This method returns an ordering between self and other values if one exists. Read more

This method tests less than (for self and other) and is used by the < operator. Read more

This method tests less than or equal to (for self and other) and is used by the <= operator. Read more

This method tests greater than (for self and other) and is used by the > operator. Read more

This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

impl Default for Currency
[src]

impl Sub<Currency> for Currency
[src]

Overloads the '-' operator for Currency objects.

Panics

Panics if the minuend and subtrahend are two different types of currency, as denoted by the Currency's symbol.

impl Copy for Currency
[src]

impl Add<Currency> for Currency
[src]

Overloads the '+' operator for Currency objects.

Panics

Panics if the two addends are different types of currency, as denoted by the Currency's symbol.

impl From<i64> for Currency
[src]

converts from a i64

impl From<(i64, char)> for Currency
[src]

converts from a tuple of i64 and symbol

impl From<(char, i64)> for Currency
[src]

converts from a tuple of symbol and i64

impl Div<i64> for Currency
[src]

Overloads the '/' operator for Currency objects.

Allows a Currency to be divided by an i64.

impl Deref for Currency
[src]

Required for DerefMut

The resulting type after dereferencing

The method called to dereference a value

impl Mul<i64> for Currency
[src]

Overloads the '*' operator for Currency objects.

Allows a Currency to be multiplied by an i64.

impl Mul<f64> for Currency
[src]

Multiplies with float, probably not a good idea, help appreciated.

impl Eq for Currency
[src]

impl Serialize for Currency
[src]

impl PartialEq<Currency> for Currency
[src]

This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

impl Debug for Currency
[src]

Formats the value using the given formatter.

impl Clone for Currency
[src]

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more