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Initial release.

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Chris Morgan 2014-06-12 17:29:24 +10:00
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build/
TAGS
doc/

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.travis.yml Normal file
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env:
global:
- secure: o2bgX4ObmN5b/lG2pk7U4tSu2/h0tLUxhHe3X6ZHi7A6MFOMtZOV+7g5TJX94YyAcsT5AWFSnl1Wv4dZcIJXsFkcZguFu6WI/Psc09K3zsA6NtXrqdcKv7XRBxivTKvfZ14PYhLgOuU+o1HreCQvolr5nmiX2gORmvD2Xc3qbHI=
before_install:
- wget http://static.rust-lang.org/dist/rust-nightly-x86_64-unknown-linux-gnu.tar.gz
- tar xf rust-nightly-x86_64-unknown-linux-gnu.tar.gz
install:
- sudo ./rust-nightly-x86_64-unknown-linux-gnu/install.sh
script:
- make all docs test
after_script:
- curl http://www.rust-ci.org/artifacts/put?t=$RUSTCI_TOKEN | sh

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This project is dual-licensed under the terms of the MIT and Apache (version 2.0) licenses.
Copyright (c) 2014 Chris Morgan and the Teepee project developers

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Copyright (c) 2014 Chris Morgan and the Teepee project developers
Permission is hereby granted, free of charge, to any
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RUSTC ?= rustc
RUSTDOC ?= rustdoc
RUSTFLAGS ?= -O
RUST_REPOSITORY ?= ../rust
RUST_CTAGS ?= $(RUST_REPOSITORY)/src/etc/ctags.rust
all: anymap docs test
# Recursive wildcard function
# http://blog.jgc.org/2011/07/gnu-make-recursive-wildcard-function.html
rwildcard=$(foreach d,$(wildcard $1*),$(call rwildcard,$d/,$2) \
$(filter $(subst *,%,$2),$d))
SRC := $(call rwildcard,src/,*.rs)
LIB := build/$(shell rustc --crate-file-name src/lib.rs --crate-type rlib)
ifeq ($(LIB),build/)
# We may not have rustc or the lib.rs file may be broken.
# But don't break the rules on that account.
LIB := build/libanymap.dummy
endif
anymap: $(LIB)
$(LIB): $(SRC)
@mkdir -p build/
$(RUSTC) $(RUSTFLAGS) src/lib.rs --out-dir=build -L build
doc/anymap/index.html: $(SRC)
$(RUSTDOC) src/lib.rs -L build
build/test: $(SRC)
$(RUSTC) $(RUSTFLAGS) --test -o build/test src/lib.rs -L build
build/quicktest: $(SRC)
$(RUSTC) --test -o build/quicktest src/lib.rs -L build
# There are no tests to run this way at present. It’s all doctests.
# test: anymap doctest build/test
# build/test --test
test: anymap doctest
doctest: $(SRC) $(LIB)
$(RUSTDOC) -L build --test src/lib.rs
# Can't wait for everything to build, optimised too? OK, you can save some time here.
quicktest: build/quicktest
build/quicktest --test
docs: doc/anymap/index.html
clean:
rm -rf build/ doc/
TAGS: $(SRC)
ctags -f TAGS --options="$(RUST_CTAGS)" --language=rust -R src/
.PHONY: all docs clean test doctest quicktest anymap

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``AnyMap``
==========
If you’re familiar with Go and Go web frameworks, you may have come across the common “environment” pattern for storing data related to the request. It’s typically something like ``map[string]interface{}`` and is accessed with arbitrary strings which may clash and type assertions which are a little unwieldy and must be used very carefully.
This is madness. Hare-brained, stark, raving madness, just *asking* for things to blow up in your face. Unfortunately for people in Go, it’s the best that they can have because of its weak type system; such a thing cannot possibly be made safe without generics.
Fortunately, we can do better in Rust. Our type system is quite equal to easy, robust expression of such problems.
The ``AnyMap`` type is a friendly wrapper around a ``HashMap<TypeId, Box<Any>:'static>``, exposing a nice, easy typed interface, perfectly safe and absolutely robust.
What this means is that in an ``AnyMap`` you may store zero or one values for every type.
Instructions
------------
make
Future work
-----------
I think that the only thing left for this is filling out additional methods from ``HashMap`` as appropriate.
It’s a very simple thing.
Author
------
[Chris Morgan](http://chrismorgan.info/) ([chris-morgan](https://github.com/chris-morgan)) is the primary author and maintainer of AnyMap.
License
-------
This library is distributed under similar terms to Rust: dual licensed under the MIT license and the Apache license (version 2.0).
See LICENSE-APACHE, LICENSE-MIT, and COPYRIGHT for details.

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//! This crate provides the `AnyMap` type, a safe and convenient store for one value of each type.
#![crate_id = "anymap#0.9"]
#![crate_type = "rlib"]
#![crate_type = "dylib"]
#![warn(unnecessary_qualification, non_uppercase_statics, unsafe_block,
variant_size_difference, managed_heap_memory, unnecessary_typecast,
missing_doc, unused_result, deprecated_owned_vector)]
use std::any::{Any, AnyRefExt, AnyMutRefExt};
use std::intrinsics::TypeId;
use std::collections::HashMap;
/// A map containing zero or one values for any given type and allowing convenient,
/// type-safe access to those values.
///
/// ```rust
/// # use anymap::AnyMap;
/// let mut data = AnyMap::new();
/// assert_eq!(data.find(), None::<&int>);
/// data.insert(42i);
/// assert_eq!(data.find(), Some(&42i));
/// data.remove::<int>();
/// assert_eq!(data.find::<int>(), None);
///
/// #[deriving(PartialEq, Show)]
/// struct Foo {
/// str: String,
/// }
///
/// assert_eq!(data.find::<Foo>(), None);
/// data.insert(Foo { str: "foo".to_string() });
/// assert_eq!(data.find(), Some(&Foo { str: "foo".to_string() }));
/// data.find_mut::<Foo>().map(|foo| foo.str.push_char('t'));
/// assert_eq!(data.find::<Foo>().unwrap().str.as_slice(), "foot");
/// ```
///
/// Values containing non-static references are not permitted.
pub struct AnyMap {
data: HashMap<TypeId, Box<Any>:'static>,
}
impl AnyMap {
/// Construct a new `AnyMap`.
pub fn new() -> AnyMap {
AnyMap {
data: HashMap::new(),
}
}
}
impl AnyMap {
/// Retrieve the value stored in the map for the type `T`, if it exists.
pub fn find<'a, T: 'static>(&'a self) -> Option<&'a T> {
self.data.find(&TypeId::of::<T>()).and_then(|any| any.as_ref::<T>())
}
/// Retrieve a mutable reference to the value stored in the map for the type `T`, if it exists.
pub fn find_mut<'a, T: 'static>(&'a mut self) -> Option<&'a mut T> {
self.data.find_mut(&TypeId::of::<T>()).and_then(|any| any.as_mut::<T>())
}
/// Set the value contained in the map for the type `T`.
/// This will override any previous value stored.
pub fn insert<T: 'static>(&mut self, value: T) {
self.data.insert(TypeId::of::<T>(), box value as Box<Any>:'static);
}
/// Remove the value for the type `T` if it existed.
pub fn remove<T: 'static>(&mut self) {
self.data.remove(&TypeId::of::<T>());
}
}