[−][src]Trait gtmpl_value::FromValue
Convert Value into something.
Required methods
pub fn from_value(val: &Value) -> Option<T>
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Tries to retrieve T
from Value.
Implementations on Foreign Types
impl FromValue<i64> for i64
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pub fn from_value(val: &Value) -> Option<i64>
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Tries to retrieve i64
from Value.
Examples:
use gtmpl_value::{FromValue, Value}; let v: Value = 23i64.into(); let i = i64::from_value(&v); assert_eq!(i, Some(23i64));
impl FromValue<u64> for u64
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pub fn from_value(val: &Value) -> Option<u64>
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Tries to retrieve u64
from Value.
Examples:
use gtmpl_value::{FromValue, Value}; let v: Value = 23u64.into(); let i = u64::from_value(&v); assert_eq!(i, Some(23u64));
impl FromValue<f64> for f64
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pub fn from_value(val: &Value) -> Option<f64>
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Tries to retrieve f64
from Value.
Examples:
use gtmpl_value::{FromValue, Value}; let v: Value = 23.1f64.into(); let i = f64::from_value(&v); assert_eq!(i, Some(23.1f64));
impl FromValue<String> for String
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pub fn from_value(val: &Value) -> Option<String>
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Tries to retrieve String
from Value.
Examples:
use gtmpl_value::{FromValue, Value}; let v: Value = "foobar".into(); let s = String::from_value(&v); assert_eq!(s, Some("foobar".to_owned()));
impl<T> FromValue<Vec<T, Global>> for Vec<T> where
T: FromValue<T>,
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T: FromValue<T>,
pub fn from_value(val: &Value) -> Option<Vec<T>>
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Tries to retrieve Vec<T>
from Value.
Examples:
use gtmpl_value::{FromValue, Value}; let v: Value = vec!(1, 2, 3).into(); let v: Option<Vec<i64>> = Vec::from_value(&v); assert_eq!(v, Some(vec!(1, 2, 3)));
impl<T> FromValue<HashMap<String, T, RandomState>> for HashMap<String, T> where
T: FromValue<T>,
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T: FromValue<T>,
pub fn from_value(val: &Value) -> Option<HashMap<String, T>>
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Tries to retrieve HashMap<String, T>
from Value.
Examples:
use gtmpl_value::{FromValue, Value}; use std::collections::HashMap; let mut m = HashMap::new(); m.insert("a".to_owned(), 1); let v: Value = m.into(); let m: Option<HashMap<String, i64>> = HashMap::from_value(&v); assert!(m.is_some()); if let Some(m) = m { assert_eq!(m.get("a"), Some(&1)); }