Trait num_traits::cast::FromPrimitive

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pub trait FromPrimitive: Sized {
Show 14 methods // Required methods fn from_i64(n: i64) -> Option<Self>; fn from_u64(n: u64) -> Option<Self>; // Provided methods fn from_isize(n: isize) -> Option<Self> { ... } fn from_i8(n: i8) -> Option<Self> { ... } fn from_i16(n: i16) -> Option<Self> { ... } fn from_i32(n: i32) -> Option<Self> { ... } fn from_i128(n: i128) -> Option<Self> { ... } fn from_usize(n: usize) -> Option<Self> { ... } fn from_u8(n: u8) -> Option<Self> { ... } fn from_u16(n: u16) -> Option<Self> { ... } fn from_u32(n: u32) -> Option<Self> { ... } fn from_u128(n: u128) -> Option<Self> { ... } fn from_f32(n: f32) -> Option<Self> { ... } fn from_f64(n: f64) -> Option<Self> { ... }
}
Expand description

A generic trait for converting a number to a value.

A value can be represented by the target type when it lies within the range of scalars supported by the target type. For example, a negative integer cannot be represented by an unsigned integer type, and an i64 with a very high magnitude might not be convertible to an i32. On the other hand, conversions with possible precision loss or truncation are admitted, like an f32 with a decimal part to an integer type, or even a large f64 saturating to f32 infinity.

Required Methods§

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fn from_i64(n: i64) -> Option<Self>

Converts an i64 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

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fn from_u64(n: u64) -> Option<Self>

Converts an u64 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

Provided Methods§

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fn from_isize(n: isize) -> Option<Self>

Converts an isize to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

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fn from_i8(n: i8) -> Option<Self>

Converts an i8 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

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fn from_i16(n: i16) -> Option<Self>

Converts an i16 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

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fn from_i32(n: i32) -> Option<Self>

Converts an i32 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

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fn from_i128(n: i128) -> Option<Self>

Converts an i128 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

The default implementation converts through from_i64(). Types implementing this trait should override this method if they can represent a greater range.

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fn from_usize(n: usize) -> Option<Self>

Converts a usize to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

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fn from_u8(n: u8) -> Option<Self>

Converts an u8 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

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fn from_u16(n: u16) -> Option<Self>

Converts an u16 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

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fn from_u32(n: u32) -> Option<Self>

Converts an u32 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

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fn from_u128(n: u128) -> Option<Self>

Converts an u128 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

The default implementation converts through from_u64(). Types implementing this trait should override this method if they can represent a greater range.

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fn from_f32(n: f32) -> Option<Self>

Converts a f32 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

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fn from_f64(n: f64) -> Option<Self>

Converts a f64 to return an optional value of this type. If the value cannot be represented by this type, then None is returned.

The default implementation tries to convert through from_i64(), and failing that through from_u64(). Types implementing this trait should override this method if they can represent a greater range.

Object Safety§

This trait is not object safe.

Implementations on Foreign Types§

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impl FromPrimitive for f32

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impl FromPrimitive for f64

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impl FromPrimitive for i8

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impl FromPrimitive for i16

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impl FromPrimitive for i32

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impl FromPrimitive for i64

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impl FromPrimitive for i128

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impl FromPrimitive for isize

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impl FromPrimitive for u8

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impl FromPrimitive for u16

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impl FromPrimitive for u32

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impl FromPrimitive for u64

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impl FromPrimitive for u128

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impl FromPrimitive for usize

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impl<T: FromPrimitive> FromPrimitive for Wrapping<T>

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fn from_isize(n: isize) -> Option<Self>

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fn from_i8(n: i8) -> Option<Self>

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fn from_i16(n: i16) -> Option<Self>

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fn from_i32(n: i32) -> Option<Self>

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fn from_i64(n: i64) -> Option<Self>

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fn from_i128(n: i128) -> Option<Self>

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fn from_usize(n: usize) -> Option<Self>

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fn from_u8(n: u8) -> Option<Self>

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fn from_u16(n: u16) -> Option<Self>

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fn from_u32(n: u32) -> Option<Self>

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fn from_u64(n: u64) -> Option<Self>

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fn from_u128(n: u128) -> Option<Self>

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fn from_f32(n: f32) -> Option<Self>

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fn from_f64(n: f64) -> Option<Self>

Implementors§