blob: f7768645acc1087d7c9d4433d346c04d3766631a [file] [log] [blame]
// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <lib/fpromise/result.h>
#include <string>
#include <zxtest/zxtest.h>
namespace {
namespace example1 {
fpromise::result<int, std::string> divide(int dividend, int divisor) {
if (divisor == 0)
return fpromise::error<std::string>("divide by zero");
return fpromise::ok(dividend / divisor);
}
int try_divide(int dividend, int divisor) {
auto result = divide(dividend, divisor);
if (result.is_ok()) {
printf("%d / %d = %d\n", dividend, divisor, result.value());
return result.value();
}
printf("%d / %d: ERROR %s\n", dividend, divisor, result.error().c_str());
return -999;
}
fpromise::result<> open(std::string secret) {
printf("guessing \"%s\"\n", secret.c_str());
if (secret == "sesame") {
puts("yes!");
return fpromise::ok();
}
puts("no.");
return fpromise::error();
}
bool guess_combination() { return open("friend") || open("sesame") || open("I give up"); }
TEST(ResultExamples, test) {
EXPECT_EQ(2, try_divide(5, 2));
EXPECT_EQ(-999, try_divide(5, 0));
EXPECT_TRUE(guess_combination());
}
} // namespace example1
} // namespace