mirror of
https://github.com/pezkuwichain/pezkuwi-subxt.git
synced 2026-05-07 16:38:01 +00:00
Shawn Tabrizi
38 lines
1.5 KiB
Rust
38 lines
1.5 KiB
Rust
// Copyright 2019-2020 Parity Technologies (UK) Ltd.
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// This file is part of Substrate.
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// Substrate is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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// Substrate is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License
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// along with Substrate. If not, see <http://www.gnu.org/licenses/>.
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//! Stores the externalities in an `environmental` value to make it scope limited available.
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use crate::Externalities;
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environmental::environmental!(ext: trait Externalities);
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/// Set the given externalities while executing the given closure. To get access to the externalities
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/// while executing the given closure [`with_externalities`] grants access to them. The externalities
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/// are only set for the same thread this function was called from.
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pub fn set_and_run_with_externalities<F, R>(ext: &mut dyn Externalities, f: F) -> R
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where F: FnOnce() -> R
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{
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ext::using(ext, f)
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}
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/// Execute the given closure with the currently set externalities.
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///
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/// Returns `None` if no externalities are set or `Some(_)` with the result of the closure.
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pub fn with_externalities<F: FnOnce(&mut dyn Externalities) -> R, R>(f: F) -> Option<R> {
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ext::with(f)
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}
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