Struct ContextBuilder

pub struct ContextBuilder<M: ContextMarker> { /* private fields */ }

Builder for type-safe context configuration The builder is used to create a context with environment values and a default value.

Example

use env_type::context::{ContextBuilder, ContextMarker};
use env_type::types::{EnvType};

struct TestContext;

impl ContextMarker for TestContext {
 type Value = String;
}

let context = ContextBuilder::<TestContext>::default()
 .with_value(EnvType::Dev, "dev".to_string())
 .with_value(EnvType::Test, "test".to_string())
 .with_default("default".to_string())
 .build();

assert_eq!(context.get_for_env(&EnvType::Dev), Some("dev".to_string()));
assert_eq!(context.get_for_env(&EnvType::Test), Some("test".to_string()));
assert_eq!(context.get_for_env(&EnvType::Stg), Some("default".to_string()));

Implementations

impl<M: ContextMarker> ContextBuilder<M>

ContextBuilder implementation Create a new ContextBuilder with the environment values and default value.

pub fn with_value(self, env: EnvType, value: M::Value) -> Self

pub fn with_values<I>(self, envs: I, value: M::Value) -> Self

where I: IntoIterator<Item = EnvType>, M::Value: Clone,

pub fn with_default(self, value: M::Value) -> Self

pub fn build(self) -> Context<M>

Trait Implementations

impl<M: ContextMarker> Default for ContextBuilder<M>

fn default() -> Self

Returns the “default value” for a type.