cpp-scope-guard/test/scope_guard.cxx

//
//  scope_guard_tc.h
//  scope_guard
//
//  Created by Sam Jaffe on 1/10/17.
//
#include <memory>

#include <scope_guard/scope_guard.hpp>

#include "xcode_gtest_helper.h"

using testing::NotNull;
using testing::IsNull;

using ptr = std::shared_ptr<int>;

ptr make( int i ) { return std::make_shared<int>(i); }

#if __cplusplus > 201402L
struct example {
  ~example() {
    scope(success) { ++(*_p); };
  }
  ptr _p;
};
#endif

TEST(Scope, ExitCallsFunction) {
  ptr p = make( 5 );
  {
    scope(exit) { p.reset(); };
    EXPECT_THAT(p, NotNull());
  }
  EXPECT_THAT(p, IsNull());
}

#if __cplusplus > 201402L
TEST(ScopeFailure, NoOpOnNoexcept) {
  ptr p = make( 5 );
  try {
    scope(failure) { p.reset(); };
  } catch (...) {
  }
  EXPECT_THAT(p, NotNull());
}

TEST(ScopeFailure, RunsOnException) {
  ptr p = make( 5 );
  try {
    scope(failure) { p.reset(); };
    throw 5;
  } catch (...) {
  }
  EXPECT_THAT(p, IsNull());
}

TEST(ScopeSuccess, RunsOnNoexcept) {
  ptr p = make( 5 );
  try {
    scope(success) { p.reset(); };
  } catch (...) {
  }
  EXPECT_THAT(p, IsNull());
}

TEST(ScopeSuccess, NoOpOnException) {
  ptr p = make( 5 );
  try {
    scope(success) { p.reset(); };
    throw 5;
  } catch (...) {
  }
  EXPECT_THAT(p, NotNull());
}

TEST(Scope, CanLayer) {
  ptr p = make( 5 );
  ptr r = p;
  try {
    scope(failure) { p.reset(); };
    example ex { r };
    throw 5;
  } catch (...) {
  }
  EXPECT_THAT(p, IsNull());
  EXPECT_EQ(*r, 6);
}
#endif