Merge swapping

CMakeLists.txt

@@ -23,6 +23,7 @@ if(EXPECTED_ENABLE_TESTS)
                    ${CMAKE_CURRENT_SOURCE_DIR}/tests/issues.cpp
                    ${CMAKE_CURRENT_SOURCE_DIR}/tests/bases.cpp
                    ${CMAKE_CURRENT_SOURCE_DIR}/tests/observers.cpp
+                   ${CMAKE_CURRENT_SOURCE_DIR}/tests/swap.cpp
                    ${CMAKE_CURRENT_SOURCE_DIR}/tests/constructors.cpp)
 
   add_executable(tests ${TEST_SOURCES})

conanfile.py

@@ -26,9 +26,9 @@ conan_basic_setup()
     def build(self):
         cmake = self.configure_cmake()
         cmake.build()
-       
+
         if not tools.cross_building(self.settings):
             self.run('%s/bin/tests' % self.build_folder)
 
     def package(self):
-        self.copy('*.hpp', dst='include/tl', src='tl')
+        self.copy('*.hpp', dst='include/tl', src='tl')

test_package/CMakeLists.txt

@@ -11,4 +11,4 @@ target_link_libraries(example ${CONAN_LIBS})
 # enable_testing()
 # add_test(NAME example
 #          WORKING_DIRECTORY ${CMAKE_BINARY_DIR}/bin
-#          COMMAND example)
+#          COMMAND example)

test_package/conanfile.py

@@ -22,4 +22,4 @@ class ExpectedTestConan(ConanFile):
     def test(self):
         if not tools.cross_building(self.settings):
             os.chdir("bin")
-            self.run(".%sexample" % os.sep)
+            self.run(".%sexample" % os.sep)

test_package/example.cpp

@@ -3,7 +3,8 @@
 tl::expected<int, const char*> maybe_do_something(int i) {
   if (i < 5) {
     return 0;
-  } else {
+  }
+  else {
     return tl::make_unexpected("Uh oh");
   }
 }
@@ -12,4 +13,4 @@ int main(int argc, char** argv) {
   (void)argv;
 
   return maybe_do_something(0).value_or(-1);
-}
+}

tests/issues.cpp

@@ -110,20 +110,20 @@ TEST_CASE("Issue 43", "[issues.43]") {
 #if !(__GNUC__ <= 5)
 #include <memory>
 
-  using MaybeDataPtr = tl::expected<int, std::unique_ptr<int>>;
+using MaybeDataPtr = tl::expected<int, std::unique_ptr<int>>;
 
-  MaybeDataPtr test(int i) noexcept
-  {
-    return std::move(i);
-  }
+MaybeDataPtr test(int i) noexcept
+{
+  return std::move(i);
+}
 
-  MaybeDataPtr test2(int i) noexcept
-  {
-    return std::move(i);
-  }
+MaybeDataPtr test2(int i) noexcept
+{
+  return std::move(i);
+}
 
 TEST_CASE("Issue 49", "[issues.49]") {
   auto m = test(10)
     .and_then(test2);
 }
-#endif
+#endif

tests/swap.cpp

@@ -0,0 +1,101 @@
+#include "catch.hpp"
+#include "expected.hpp"
+
+struct no_throw {
+  no_throw(std::string i) : i(i) {}
+  std::string i;
+};
+struct canthrow_move {
+  canthrow_move(std::string i) : i(i) {}
+  canthrow_move(canthrow_move const &) = default;
+  canthrow_move(canthrow_move &&other) noexcept(false) : i(other.i) {}
+  canthrow_move &operator=(canthrow_move &&) = default;
+  std::string i;
+};
+
+bool should_throw = false;
+struct willthrow_move {
+  willthrow_move(std::string i) : i(i) {}
+  willthrow_move(willthrow_move const &) = default;
+  willthrow_move(willthrow_move &&other) : i(other.i) {
+    if (should_throw)
+      throw 0;
+  }
+  willthrow_move &operator=(willthrow_move &&) = default;
+  std::string i;
+};
+static_assert(tl::detail::is_swappable<no_throw>::value, "");
+
+template <class T1, class T2> void swap_test() {
+  std::string s1 = "abcdefghijklmnopqrstuvwxyz";
+  std::string s2 = "zyxwvutsrqponmlkjihgfedcba";
+
+  tl::expected<T1, T2> a{s1};
+  tl::expected<T1, T2> b{s2};
+  swap(a, b);
+  REQUIRE(a->i == s2);
+  REQUIRE(b->i == s1);
+
+  a = s1;
+  b = tl::unexpected<T2>(s2);
+  swap(a, b);
+  REQUIRE(a.error().i == s2);
+  REQUIRE(b->i == s1);
+
+  a = tl::unexpected<T2>(s1);
+  b = s2;
+  swap(a, b);
+  REQUIRE(a->i == s2);
+  REQUIRE(b.error().i == s1);
+
+  a = tl::unexpected<T2>(s1);
+  b = tl::unexpected<T2>(s2);
+  swap(a, b);
+  REQUIRE(a.error().i == s2);
+  REQUIRE(b.error().i == s1);
+
+  a = s1;
+  b = s2;
+  a.swap(b);
+  REQUIRE(a->i == s2);
+  REQUIRE(b->i == s1);
+
+  a = s1;
+  b = tl::unexpected<T2>(s2);
+  a.swap(b);
+  REQUIRE(a.error().i == s2);
+  REQUIRE(b->i == s1);
+
+  a = tl::unexpected<T2>(s1);
+  b = s2;
+  a.swap(b);
+  REQUIRE(a->i == s2);
+  REQUIRE(b.error().i == s1);
+
+  a = tl::unexpected<T2>(s1);
+  b = tl::unexpected<T2>(s2);
+  a.swap(b);
+  REQUIRE(a.error().i == s2);
+  REQUIRE(b.error().i == s1);
+}
+
+TEST_CASE("swap") {
+
+  swap_test<no_throw, no_throw>();
+  swap_test<no_throw, canthrow_move>();
+  swap_test<canthrow_move, no_throw>();
+
+  std::string s1 = "abcdefghijklmnopqrstuvwxyz";
+  std::string s2 = "zyxwvutsrqponmlkjihgfedcbaxxx";
+  tl::expected<no_throw, willthrow_move> a{s1};
+  tl::expected<no_throw, willthrow_move> b{tl::unexpect, s2};
+  should_throw = 1;
+
+  #ifdef _MSC_VER
+  //this seems to break catch on GCC and Clang
+  REQUIRE_THROWS(swap(a, b));
+  #endif
+
+  REQUIRE(a->i == s1);
+  REQUIRE(b.error().i == s2);
+}

tests/test.cpp

@@ -0,0 +1,32 @@
+struct no_throw {
+  no_throw(std::string i) : i(i) {}
+  std::string i;
+};
+struct canthrow_move {
+  canthrow_move(std::string i) : i(i) {}
+  canthrow_move(canthrow_move const &) = default;
+  canthrow_move(canthrow_move &&other) noexcept(false) : i(other.i) {}
+  canthrow_move &operator=(canthrow_move &&) = default;
+  std::string i;
+};
+
+bool should_throw = false;
+struct willthrow_move {
+  willthrow_move(std::string i) : i(i) {}
+  willthrow_move(willthrow_move const &) = default;
+  willthrow_move(willthrow_move &&other) : i(other.i) {
+    if (should_throw)
+      throw 0;
+  }
+  willthrow_move &operator=(willthrow_move &&) = default;
+  std::string i;
+};
+
+int main() {
+  std::string s1 = "abcdefghijklmnopqrstuvwxyz";
+  std::string s2 = "zyxwvutsrqponmlkjihgfedcbaxxx";
+  tl::expected<no_throw, willthrow_move> a{s1};
+  tl::expected<no_throw, willthrow_move> b{tl::unexpect, s2};
+  should_throw = 1;
+  swap(a, b);
+}