test cases: Test Swift interoperability with C++

Skip if Swift 5.9 or above is not detected.

Author: tangalbert919

test cases/swift/10 mixed cpp/main.swift

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+testCallFromSwift()
+testCallWithParam("Calling C++ function from Swift with param is working")
+
+var test = Test()
+var testtwo = Test(1)
+test.testCallFromClass()

test cases/swift/10 mixed cpp/meson.build

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+project('mixed cpp', 'cpp', 'swift')
+
+swiftc = meson.get_compiler('swift')
+
+# Testing C++ and Swift interoperability requires Swift 5.9
+if not swiftc.version().version_compare('>= 5.9')
+  error('MESON_SKIP_TEST Test requires Swift 5.9')
+endif
+
+lib = static_library('mylib', 'mylib.cpp')
+exe = executable('prog', 'main.swift', 'mylib.h', link_with: lib)
+test('cpp interface', exe)

test cases/swift/10 mixed cpp/mylib.cpp

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+#include "mylib.h"
+#include <iostream>
+
+Test::Test() {
+    std::cout << "Test initialized" << std::endl;
+}
+    
+Test::Test(int param) {
+    std::cout << "Test initialized with param " << param << std::endl;
+}
+
+void Test::testCallFromClass() {
+    std::cout << "Calling C++ class function from Swift is working" << std::endl;
+}
+
+void testCallFromSwift() {
+    std::cout << "Calling this C++ function from Swift is working" << std::endl;
+}
+
+void testCallWithParam(const std::string &param) {
+    std::cout << param << std::endl;
+}

test cases/swift/10 mixed cpp/mylib.h

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+#pragma once
+#include <string>
+
+class Test {
+public:
+    Test();
+    Test(int param);
+
+    void testCallFromClass();
+};
+
+void testCallFromSwift();
+void testCallWithParam(const std::string &param);

test cases/swift/11 mixed objcpp/main.swift

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+var test: ObjCPPTest = ObjCPPTest()
+test.testCallToObjCPP()

test cases/swift/11 mixed objcpp/meson.build

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+project('mixed objcpp', 'objcpp', 'swift')
+
+swiftc = meson.get_compiler('swift')
+
+# Testing Objective-C++ and Swift interoperability requires Swift 5.9
+if not swiftc.version().version_compare('>= 5.9')
+  error('MESON_SKIP_TEST Test requires Swift 5.9')
+endif
+
+lib = static_library('mylib', 'mylib.mm')
+exe = executable('prog', 'main.swift', 'mylib.h', link_with: lib)
+test('objcpp interface', exe)

test cases/swift/11 mixed objcpp/mylib.h

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+#pragma once
+#import <Foundation/Foundation.h>
+
+class Test {
+public:
+    Test();
+
+    void testCallFromClass();
+};
+
+@interface ObjCPPTest: NSObject {
+    @private Test *test;
+}
+- (id)init;
+- (void)dealloc;
+- (void)testCallToObjCPP;
+@end

test cases/swift/11 mixed objcpp/mylib.mm

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+#include "mylib.h"
+#include <iostream>
+
+Test::Test() {
+    std::cout << "Test initialized" << std::endl;
+}
+
+void Test::testCallFromClass() {
+    std::cout << "Calling Objective-C++ class function from Swift is working" << std::endl;
+}
+
+@implementation ObjCPPTest
+- (id)init {
+    self = [super init];
+    if (self) {
+        test = new Test();
+    }
+    return self;
+}
+
+- (void)dealloc {
+    delete test;
+    [super dealloc];
+}
+
+- (void)testCallToObjCPP {
+    test->testCallFromClass();
+}
+@end