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template <class _Ty>
_NODISCARD /* constexpr */ _Ty _Common_lerp(const _Ty _ArgA, const _Ty _ArgB, const _Ty _ArgT) noexcept {
// on a line intersecting {(0.0, _ArgA), (1.0, _ArgB)}, return the Y value for X == _ArgT
const int _Finite_mask = (int{isfinite(_ArgA)} << 2) | (int{isfinite(_ArgB)} << 1) | int{isfinite(_ArgT)};
if (_Finite_mask == 0b111) {
// 99% case, put it first; this block comes from P0811R3
if ((_ArgA <= 0 && _ArgB >= 0) || (_ArgA >= 0 && _ArgB <= 0)) {
// exact, monotonic, bounded, determinate, and (for _ArgA == _ArgB == 0) consistent:
return _ArgT * _ArgB + (1 - _ArgT) * _ArgA;
// Copyright (c) 2019–20 Adam Sharp and thoughtbot, inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
@freak4pc
freak4pc / Combine+WithLatestFrom.swift
Last active November 25, 2024 05:58
withLatestFrom for Apple's Combine
//
// Combine+WithLatestFrom.swift
//
// Created by Shai Mishali on 29/08/2019.
// Copyright © 2019 Shai Mishali. All rights reserved.
//
import Combine
// MARK: - Operator methods
@ZevEisenberg
ZevEisenberg / RxSignpost.swift
Last active March 16, 2022 01:54
Use os_signpost for performance logging of transformations in RxSwift
// RxSwift signposts
import os.signpost
import RxSwift
func signpost<T>(log: OSLog, name: StaticString, value: String, _ thing: () throws -> T) rethrows -> T {
let signpostID = OSSignpostID(log: log)
os_signpost(
.begin,
@AliSoftware
AliSoftware / Bindings.swift
Last active March 26, 2025 12:10
Re-implementation of @binding and @State (from SwiftUI) myself to better understand it
/*:
This is a concept re-implementation of the @Binding and @State property wrappers from SwiftUI
The only purpose of this code is to implement those wrappers myself
just to understand how they work internally and why they are needed,
⚠️ This is not supposed to be a reference implementation nor cover all
subtleties of the real Binding and State types.
The only purpose of this playground is to show how re-implementing
them myself has helped me understand the whole thing better
@IanKeen
IanKeen / Value.swift
Last active June 25, 2019 16:47
Brute force generic Codable value that lets you work in 1 type while maintaining the raw type
public typealias LosslessStringCodable = LosslessStringConvertible & Codable
public struct Value<T: LosslessStringCodable>: Codable {
private let type: LosslessStringCodable.Type
public var value: T
public init(from decoder: Decoder) throws {
do {
self.value = try T.init(from: decoder)
@IanKeen
IanKeen / DictionaryEncoder.swift
Last active May 4, 2021 14:36
DictionaryEncoder for Encodable types
class DictionaryEncoder {
init() { }
func encode(_ value: Encodable) throws -> [String: Any] {
let encoder = _Encoder(codingPath: [])
try value.encode(to: encoder)
guard let result = encoder.value as? [String: Any] else {
throw EncodingError.invalidValue(encoder.value as Any, .init(codingPath: [], debugDescription: "Invalid root container"))
}
extension Never {
/// A developer facing statement explaining how program correctness has failed.
public struct Reason: CustomStringConvertible {
public let description: String
public init(_ rationale: String) {
self.description = rationale
}
}
}
@danielt1263
danielt1263 / TokenAcquisitionService.swift
Last active August 30, 2024 06:33
The TokenAcquisitionService automatically retry requests if it receives an unauthorized error. Complete with proof that it works correctly.
//
// TokenAcquisitionService.swift
//
// Created by Daniel Tartaglia on 16 Jan 2019.
// Copyright © 2024 Daniel Tartaglia. MIT License.
//
import Foundation
import RxSwift
@IanKeen
IanKeen / Debounce.swift
Created January 16, 2019 19:13
Simple debouncer
func debounce<T>(delay: TimeInterval, function: @escaping (T) -> Void, complete: @escaping () -> Void = { }) -> (T) -> Void {
let queue = DispatchQueue(label: "Debouncer")
var current: DispatchWorkItem?
return { input in
current?.cancel()
let new = DispatchWorkItem {
function(input)
complete()
}