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ANKCoreInteger+Multiplication.swift
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//=----------------------------------------------------------------------------=
// This source file is part of the AwesomeNumbersKit open source project.
//
// Copyright (c) 2022 Oscar Byström Ericsson
// Licensed under Apache License, Version 2.0
//
// See http://www.apache.org/licenses/LICENSE-2.0 for license information.
//=----------------------------------------------------------------------------=
#if DEBUG
import ANKCoreKit
import XCTest
//*============================================================================*
// MARK: * ANK x Core Integer x Multiplication
//*============================================================================*
final class ANKCoreIntegerTestsOnMultiplication: XCTestCase {
typealias T = any ANKCoreInteger.Type
//=------------------------------------------------------------------------=
// MARK: State
//=------------------------------------------------------------------------=
let types: [T] = ANKCoreIntegerTests.types
//=------------------------------------------------------------------------=
// MARK: Tests
//=------------------------------------------------------------------------=
func testMultiplying() {
func whereIsSigned<T>(_ type: T.Type) where T: ANKCoreInteger {
ANKAssertMultiplication(T( 3), T( 0), T( 0))
ANKAssertMultiplication(T( 3), T(-0), T(-0))
ANKAssertMultiplication(T(-3), T( 0), T(-0))
ANKAssertMultiplication(T(-3), T(-0), T( 0))
ANKAssertMultiplication(T( 3), T( 1), T( 3))
ANKAssertMultiplication(T( 3), T(-1), T(-3))
ANKAssertMultiplication(T(-3), T( 1), T(-3))
ANKAssertMultiplication(T(-3), T(-1), T( 3))
ANKAssertMultiplication(T( 3), T( 2), T( 6))
ANKAssertMultiplication(T( 3), T(-2), T(-6))
ANKAssertMultiplication(T(-3), T( 2), T(-6))
ANKAssertMultiplication(T(-3), T(-2), T( 6))
}
func whereIsUnsigned<T>(_ type: T.Type) where T: ANKCoreInteger {
ANKAssertMultiplication(T( 3), T( 0), T( 0))
ANKAssertMultiplication(T( 3), T( 1), T( 3))
ANKAssertMultiplication(T( 3), T( 2), T( 6))
}
for type: T in types {
type.isSigned ? whereIsSigned(type) : whereIsUnsigned(type)
}
}
func testMultiplyingReportingOverflow() {
func whereIsSigned<T>(_ type: T.Type) where T: ANKCoreInteger {
ANKAssertMultiplication(T.max, T( 1), T.max, T( 0), false)
ANKAssertMultiplication(T.max, T(-1), T.min + T(1), T(-1), false)
ANKAssertMultiplication(T.min, T( 1), T.min, T(-1), false)
ANKAssertMultiplication(T.min, T(-1), T.min, T( 0), true )
ANKAssertMultiplication(T.max, T( 2), T(-2), T( 0), true )
ANKAssertMultiplication(T.max, T(-2), T( 2), T(-1), true )
ANKAssertMultiplication(T.min, T( 2), T( 0), T(-1), true )
ANKAssertMultiplication(T.min, T(-2), T( 0), T( 1), true )
ANKAssertMultiplication(T.max, T.max, T( 1), T.max >> (1), true)
ANKAssertMultiplication(T.max, T.min, T.min, T(-1) << (T.bitWidth - 2), true)
ANKAssertMultiplication(T.min, T.max, T.min, T(-1) << (T.bitWidth - 2), true)
ANKAssertMultiplication(T.min, T.min, T( 0), T( 1) << (T.bitWidth - 2), true)
}
func whereIsUnsigned<T>(_ type: T.Type) where T: ANKCoreInteger {
ANKAssertMultiplication(T.max, T( 2), ~T(1), T(1), true)
ANKAssertMultiplication(T.max, T.max, T(1), ~T(1), true)
}
for type: T in types {
type.isSigned ? whereIsSigned(type) : whereIsUnsigned(type)
}
}
//=------------------------------------------------------------------------=
// MARK: Tests x Miscellaneous
//=------------------------------------------------------------------------=
func testOverloadsAreUnambiguousWhenUsingIntegerLiterals() {
func becauseThisCompilesSuccessfully(_ x: inout some ANKCoreInteger) {
XCTAssertNotNil(x *= 0)
XCTAssertNotNil(x &*= 0)
XCTAssertNotNil(x.multiplyReportingOverflow(by: 0))
XCTAssertNotNil(x.multiplyFullWidth(by: 0))
XCTAssertNotNil(x * 0)
XCTAssertNotNil(x &* 0)
XCTAssertNotNil(x.multipliedReportingOverflow(by: 0))
XCTAssertNotNil(x.multipliedFullWidth(by: 0))
}
}
}
#endif