├── .gitignore ├── tests ├── build_script.rs └── test.rs ├── Cargo.toml ├── .travis.yml ├── LICENSE-MIT ├── src └── lib.rs ├── README.md └── LICENSE-APACHE /.gitignore: -------------------------------------------------------------------------------- 1 | /target 2 | **/*.rs.bk 3 | Cargo.lock 4 | -------------------------------------------------------------------------------- /tests/build_script.rs: -------------------------------------------------------------------------------- 1 | // Since the test in the build script are not run, force them to be run from here. 2 | 3 | #[allow(dead_code)] 4 | #[path = "../build.rs"] 5 | mod build; 6 | -------------------------------------------------------------------------------- /Cargo.toml: -------------------------------------------------------------------------------- 1 | [package] 2 | name = "if_rust_version" 3 | build = "build.rs" 4 | version = "1.0.0" 5 | authors = ["Olivier Goffart "] 6 | description = "Macro to enable or disable code depending on the rust version" 7 | readme = "README.md" 8 | license = "MIT/Apache-2.0" 9 | keywords = ["version", "check", "rustc"] 10 | repository = "https://github.com/ogoffart/if_rust_version" 11 | documentation = "https://docs.rs/if_rust_version" 12 | categories = ["development-tools", "no-std"] 13 | 14 | 15 | -------------------------------------------------------------------------------- /.travis.yml: -------------------------------------------------------------------------------- 1 | language: rust 2 | rust: 3 | - 1.12.0 # oldest supported 4 | - 1.14.0 # fist version with support of macro within macro (for the tests) 5 | - 1.16.0 6 | - 1.24.0 7 | - 1.28.0 8 | - 1.29.2 9 | - 1.30.0 # first with path to invoke macros 10 | - 1.31.0 # first version with const_fn 11 | - 1.36.0 # first version with MaybeUninit 12 | - 1.37.0 # most tested version 13 | - stable 14 | - beta 15 | - nightly 16 | sudo: false 17 | script: 18 | - cargo test 19 | notifications: 20 | email: 21 | on_success: never 22 | -------------------------------------------------------------------------------- /LICENSE-MIT: -------------------------------------------------------------------------------- 1 | Copyright (c) 2019 Olivier Goffart 2 | 3 | Permission is hereby granted, free of charge, to any 4 | person obtaining a copy of this software and associated 5 | documentation files (the "Software"), to deal in the 6 | Software without restriction, including without 7 | limitation the rights to use, copy, modify, merge, 8 | publish, distribute, sublicense, and/or sell copies of 9 | the Software, and to permit persons to whom the Software 10 | is furnished to do so, subject to the following 11 | conditions: 12 | 13 | The above copyright notice and this permission notice 14 | shall be included in all copies or substantial portions 15 | of the Software. 16 | 17 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF 18 | ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED 19 | TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A 20 | PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT 21 | SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY 22 | CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION 23 | OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR 24 | IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 25 | DEALINGS IN THE SOFTWARE. 26 | -------------------------------------------------------------------------------- /src/lib.rs: -------------------------------------------------------------------------------- 1 | /*! 2 | 3 | This is a small crate that just export one macro that allow you to have code 4 | conditionally of the rust version. 5 | 6 | The [`if_rust_version!`](macro.if_rust_version.html) macro allows you to still 7 | support older version 8 | of rustc while still using conditionally new features of the compiler 9 | 10 | # Examples 11 | 12 | The release of rust 1.36 stabilized the `MaybeUninit` union as a replacement 13 | for the to be deprecated `mem::uninitialized`. One might want to use 14 | MaybeUninit when the compiler supports it, but not without requiring a recent compiler. 15 | 16 | The `if_rust_version!` macro is exactly what one needs: 17 | 18 | ```rust 19 | # #[macro_use] extern crate if_rust_version; 20 | # fn main() { 21 | # use std::mem; 22 | # use std::ptr; 23 | if_rust_version! { >= 1.36 { 24 | let mut x = std::mem::MaybeUninit::::uninit(); 25 | unsafe { x.as_mut_ptr().write(32); } 26 | let xx = unsafe { x.assume_init() }; 27 | } else { 28 | let mut xx : u32 = unsafe { mem::uninitialized() }; 29 | unsafe { ptr::write(&mut xx as *mut u32, 32); } 30 | }} 31 | assert_eq!(xx, 32); 32 | # } 33 | ``` 34 | */ 35 | #![cfg_attr( 36 | not(test_no_submacro), 37 | doc = r#" 38 | 39 | The macro can be used to declare items or expression. 40 | 41 | It can also be usefull to declare macro for pattern you often use. 42 | For example, if we want to declare functions const from rust 1.31 which 43 | introduced the concept: 44 | 45 | ``` 46 | # #[macro_use] extern crate if_rust_version; 47 | # fn main() { 48 | if_rust_version! { >= 1.31 { 49 | // just a identity macro that forward the item 50 | macro_rules! const_fn { ($f:item) => { $f } } 51 | } else { 52 | // remove the 'const' 53 | macro_rules! const_fn { 54 | ($(#[$m:meta])* const fn $($rest:tt)*) => { $(#[$m])* fn $($rest)* }; 55 | ($(#[$m:meta])* pub const fn $($rest:tt)*) => { 56 | $(#[$m])* 57 | /// This function is a const fn from rust 1.31 58 | pub fn $($rest)* 59 | }; 60 | } 61 | }} 62 | 63 | const_fn!{ 64 | /// This function is const chen the compiler supports it 65 | pub const fn hello(x : u32) -> u32 { x + 2 } 66 | } 67 | # } 68 | ``` 69 | "# 70 | )] 71 | /*! 72 | 73 | # Minimum Rust version 74 | 75 | The minimum rust version is rust 1.12, because previous versions were 76 | not expanding `tt` correcrtly in `macro_rules!` 77 | 78 | This crate has no dependencies, and is `#![no-std]`. 79 | 80 | # Comparison with other crates 81 | 82 | There are other crates that check the rust version number: 83 | [version_check](https://crates.io/crates/version_check) and 84 | [rustc_version](https://crates.io/crates/rustc_version). 85 | 86 | The main difference is that these crates are meant to to be 87 | used by first writing a `build.rs` script to then add some 88 | feature flag. 89 | 90 | */ 91 | 92 | #![no_std] 93 | 94 | include!(concat!(env!("OUT_DIR"), "/generated.rs")); 95 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # if_rust_version 2 | 3 | [![Build Status](https://travis-ci.org/ogoffart/if_rust_version.svg?branch=master)](https://travis-ci.org/ogoffart/if_rust_version) 4 | [![Crates.io](https://img.shields.io/crates/v/if_rust_version.svg)](https://crates.io/crates/if_rust_version) 5 | [![docs](https://docs.rs/if_rust_version/badge.svg)](https://docs.rs/if_rust_version) 6 | ![Minimum Rust version: 1.12](https://img.shields.io/badge/rustc-1.12+-lightgray.svg) 7 | 8 | This is a small crate that just export one macro that allow you to have code 9 | conditionally of the rust version. 10 | The `if_rust_version!` macro allows you to still 11 | support older version 12 | of rustc while still using conditionally new features of the compiler 13 | 14 | ## Examples 15 | 16 | The release of rust 1.36 stabilized the `MaybeUninit` union as a replacement 17 | for the to be deprecated `mem::uninitialized`. One might want to use 18 | MaybeUninit when the compiler supports it, but not without requiring a recent compiler. 19 | 20 | The `if_rust_version!` macro is exactly what one needs: 21 | 22 | ```rust 23 | if_rust_version! { >= 1.36 { 24 | let mut x = std::mem::MaybeUninit::::uninit(); 25 | unsafe { x.as_mut_ptr().write(32); } 26 | let xx = unsafe { x.assume_init() }; 27 | } else { 28 | let mut xx : u32 = unsafe { mem::uninitialized() }; 29 | unsafe { ptr::write(&mut xx as *mut u32, 32); } 30 | }} 31 | ``` 32 | 33 | The macro can be used to declare items or expression. 34 | 35 | It can also be usefull to declare macro for pattern you often use. 36 | For example, if we want to declare functions const from rust 1.31 which 37 | introduced the concept: 38 | 39 | ```rust 40 | if_rust_version! { >= 1.31 { 41 | // just a identity macro that forward the item 42 | macro_rules! const_fn { ($f:item) => { $f } } 43 | } else { 44 | // remove the 'const' 45 | macro_rules! const_fn { 46 | ($(#[$m:meta])* const fn $($rest:tt)*) => { $(#[$m])* fn $($rest)* }; 47 | ($(#[$m:meta])* pub const fn $($rest:tt)*) => { 48 | $(#[$m])* 49 | /// This function is a const fn from rust 1.31 50 | pub fn $($rest)* 51 | }; 52 | } 53 | }} 54 | 55 | const_fn!{ 56 | /// This function is const chen the compiler supports it 57 | pub const fn hello(x : u32) -> u32 { x + 2 } 58 | } 59 | ``` 60 | 61 | ## Minimum Rust version 62 | 63 | The minimum rust version is rust 1.12, because previous versions were 64 | not expanding `tt` correcrtly in `macro_rules!` 65 | 66 | This crate has no dependencies, and is `#![no-std]`. 67 | 68 | ## Comparison with other crates 69 | 70 | There are other crates that check the rust version number: 71 | 72 | The main difference with 73 | [version_check](https://crates.io/crates/version_check) and 74 | [rustc_version](https://crates.io/crates/rustc_version) is that these crates 75 | are meant to to be used by first writing a `build.rs` script to then add some 76 | feature flag. 77 | 78 | [rustversion](https://crates.io/crates/rustversion) is a attribute macro, 79 | this has the disadvantage not to be able to be used for feature which add 80 | new grammar to the language (example: `?` or `10u128` or `impl Trait`). 81 | Also attribute macros were only stabilized recently, and do not support 82 | expanding to expressions yet. Not to mention the need to use heavy dependencies 83 | such as `syn` to develop procedural macro. 84 | 85 | There is also a proposed [RFC 2523](https://github.com/rust-lang/rfcs/pull/2523) 86 | which suggest allowing to query the rust version via the `#[cfg(...)]` attributes. 87 | 88 | ## Licenses: 89 | 90 | MIT/Apache-2.0 91 | -------------------------------------------------------------------------------- /tests/test.rs: -------------------------------------------------------------------------------- 1 | #[macro_use] 2 | extern crate if_rust_version; 3 | 4 | #[test] 5 | fn basic() { 6 | let foo = if_rust_version! { >= 1.0 { "Hello" } else { "World" ;; error ;; }}; 7 | assert_eq!(foo, "Hello"); 8 | 9 | let fo2 = if_rust_version! { >= 1.999 { "Hello" ;; error ;; } else { "World" }}; 10 | assert_eq!(fo2, "World"); 11 | 12 | if_rust_version! { < 1.0 { let x = :error:; } else { let x = 24; }}; 13 | assert_eq!(x, 24); 14 | 15 | if_rust_version! { < 1.999 { let x = 44; } else { let x = ~error~; }}; 16 | assert_eq!(x, 44); 17 | } 18 | 19 | if_rust_version! { >= 1.0 { fn fn1() -> bool { true } } else { something wrong } } 20 | if_rust_version! { <= 1.999 { fn fn2() -> bool { true } } } 21 | if_rust_version! { != 1.999 { fn fn3() -> bool { true } } else {} } 22 | if_rust_version! { < 1.0 { } else if rust_version >= 1.0 { fn fn4() -> bool { true } } } 23 | if_rust_version! { > 1.999 { something wrong } else if rust_version != 1.998 { fn fn5() -> bool { true } } else { } } 24 | 25 | #[test] 26 | fn testfn() { 27 | assert!(fn1()); 28 | assert!(fn2()); 29 | assert!(fn3()); 30 | assert!(fn4()); 31 | assert!(fn5()); 32 | } 33 | 34 | #[test] 35 | fn test_uninit() { 36 | unsafe fn init_bool(x: *mut bool) { 37 | std::ptr::write(x, true); 38 | } 39 | 40 | let b: bool = { 41 | if_rust_version! { >= 1.36 { 42 | let mut x = std::mem::MaybeUninit::::uninit(); 43 | unsafe { init_bool(x.as_mut_ptr()); } 44 | unsafe { x.assume_init() } 45 | } else { 46 | let mut x : bool = unsafe { std::mem::uninitialized() }; 47 | unsafe { init_bool(&mut x as *mut bool) } 48 | x 49 | }} 50 | }; 51 | assert_eq!(b, true); 52 | } 53 | 54 | if_rust_version! { == 1.37 { 55 | #[test] 56 | fn test_37() { 57 | if_rust_version!(== nightly { error }); 58 | assert!(if_rust_version!(== nightly { ~ error ~ } else { true })); 59 | assert!(if_rust_version!(== nightly { ~ error ~ } else if rust_version != nightly { true })); 60 | assert!(if_rust_version!(== nightly { ~ error ~ } else if rust_version != nightly { true } else { ~error~ })); 61 | 62 | assert!(if_rust_version!(> 1.37 { ~ error ~ } else if rust_version > 1.36 { true } else { ~error~ })); 63 | assert!(if_rust_version!(< 1.37 { ~ error ~ } else if rust_version < 1.38 { true } else { ~error~ })); 64 | assert!(if_rust_version!(< 1.34 { ~ error ~ } else if rust_version <= 1.37 { true } else { ~error~ })); 65 | assert!(if_rust_version!(< 1.32 { ~ error ~ } else if rust_version <= 1.36 { error~ } else { true })); 66 | assert!(if_rust_version!(!= 1.34 { true })); 67 | assert!(if_rust_version!(!= 1.36 { true })); 68 | assert!(if_rust_version!(!= 1.38 { true })); 69 | if_rust_version!(== 1.36 { ~ error } else if rust_version == 1.38 { ~ error }); 70 | if_rust_version!(<= 1.36 { ~ error } else if rust_version >= 1.38 { ~ error }); 71 | if_rust_version!(< 1.36 { ~ error } else if rust_version > 1.38 { ~ error }); 72 | if_rust_version!(< 1.37 { ~ error } else if rust_version > 1.37 { ~ error }); 73 | if_rust_version!(!= 1.37 { ~ error } else if rust_version > 1.39 { ~ error }); 74 | } 75 | }} 76 | 77 | #[test] 78 | fn more_tests() { 79 | if_rust_version!(== nightly { let x = 2; } else if rust_version != nightly { let x = 3; }); 80 | assert!(x != 1); 81 | 82 | if_rust_version!(> 1.31 { fn a() -> u32 { 1 } }); 83 | if_rust_version!(<= 1.31 { fn a() -> u32 { 1 } }); 84 | 85 | if_rust_version!(== 1.10 { fn b() -> u32 { 1 } }); 86 | if_rust_version!(!= 1.10 { fn b() -> u32 { 1 } }); 87 | 88 | if_rust_version!(> 1.0 { fn c() -> u32 { 1 } }); 89 | if_rust_version!(== 1.0 { fn c() -> u32 { 1 } }); 90 | 91 | if_rust_version!(< 1.13 { fn d() -> u32 { 1 } }); 92 | if_rust_version!(>= 1.13 { fn d() -> u32 { 1 } }); 93 | 94 | if_rust_version!(< 1.28 { fn e() -> u32 { 1 } }); 95 | if_rust_version!(== 1.28 { fn e() -> u32 { 1 } }); 96 | if_rust_version!(> 1.28 { fn e() -> u32 { 1 } }); 97 | 98 | assert_eq!(a() + b() + c() + d() + e(), 5); 99 | } 100 | 101 | #[test] 102 | fn item_expr() { 103 | assert_eq!( 104 | { 105 | if_rust_version! { > 1.2 { 106 | fn foo_1() -> u32 { 11 } 107 | foo_1() 108 | } else { 109 | fn foo_2() -> u32 { 11 } 110 | foo_2() 111 | }} 112 | }, 113 | 11 114 | ); 115 | } 116 | 117 | #[cfg(not(test_no_submacro))] 118 | mod xx { 119 | 120 | if_rust_version! { < 1.31 { 121 | macro_rules! const_fn { 122 | ($(#[$m:meta])* const fn $($rest:tt)*) => { 123 | $(#[$m])* fn $($rest)* 124 | }; 125 | ($(#[$m:meta])* pub const fn $($rest:tt)*) => { 126 | $(#[$m])* 127 | /// 128 | /// This function is a const fn from rust 1.33 129 | pub fn $($rest)* 130 | }; 131 | } 132 | } else { 133 | macro_rules! const_fn { ($f:item) => { $f } } 134 | }} 135 | 136 | const_fn! { 137 | /// Function which is constant for some version of the compiler 138 | #[inline] 139 | pub const fn foo_const(x : u32) -> u32 { x + 2 } 140 | } 141 | 142 | #[test] 143 | fn test_const_fn() { 144 | assert_eq!(foo_const(44), 46); 145 | } 146 | } 147 | 148 | #[test] 149 | fn new_syntax() { 150 | let x = if_rust_version!(>= 1.26 { 1000u128 } else { 1000 }); 151 | assert_eq!(x, 1000); 152 | if_rust_version! 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