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Add ripple::Expected which simulates std::expected:

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Also integrates use of ripple::Expected into the code base.
This commit is contained in:
Scott Schurr
2021-08-16 11:27:05 -07:00
committed by Nik Bougalis
parent de43d43560
commit c50d166c23
14 changed files with 557 additions and 69 deletions
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212
src/test/basics/Expected_test.cpp Normal file
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//------------------------------------------------------------------------------
/*
This file is part of rippled: https://github0.com/ripple/rippled
Copyright (c) 2012-2016 Ripple Labs Inc.
Permission to use, copy, modify, and/or distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL , DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
//==============================================================================
#include <ripple/basics/Expected.h>
#include <ripple/beast/unit_test.h>
#include <ripple/protocol/TER.h>
#include <array>
#include <cstdint>
namespace ripple {
namespace test {
struct Expected_test : beast::unit_test::suite
{
void
run() override
{
// Test non-error const construction.
{
auto const expected = []() -> Expected<std::string, TER> {
return "Valid value";
}();
BEAST_EXPECT(expected);
BEAST_EXPECT(expected.has_value());
BEAST_EXPECT(expected.value() == "Valid value");
BEAST_EXPECT(*expected == "Valid value");
BEAST_EXPECT(expected->at(0) == 'V');
bool throwOccurred = false;
try
{
// There's no error, so should throw.
[[maybe_unused]] TER const t = expected.error();
}
catch (std::runtime_error const& e)
{
BEAST_EXPECT(e.what() == std::string("bad expected access"));
throwOccurred = true;
}
BEAST_EXPECT(throwOccurred);
}
// Test non-error non-const construction.
{
auto expected = []() -> Expected<std::string, TER> {
return "Valid value";
}();
BEAST_EXPECT(expected);
BEAST_EXPECT(expected.has_value());
BEAST_EXPECT(expected.value() == "Valid value");
BEAST_EXPECT(*expected == "Valid value");
BEAST_EXPECT(expected->at(0) == 'V');
std::string mv = std::move(*expected);
BEAST_EXPECT(mv == "Valid value");
bool throwOccurred = false;
try
{
// There's no error, so should throw.
[[maybe_unused]] TER const t = expected.error();
}
catch (std::runtime_error const& e)
{
BEAST_EXPECT(e.what() == std::string("bad expected access"));
throwOccurred = true;
}
BEAST_EXPECT(throwOccurred);
}
// Test error construction from rvalue.
{
auto const expected = []() -> Expected<std::string, TER> {
return Unexpected(telLOCAL_ERROR);
}();
BEAST_EXPECT(!expected);
BEAST_EXPECT(!expected.has_value());
BEAST_EXPECT(expected.error() == telLOCAL_ERROR);
bool throwOccurred = false;
try
{
// There's no result, so should throw.
[[maybe_unused]] std::string const s = *expected;
}
catch (std::runtime_error const& e)
{
BEAST_EXPECT(e.what() == std::string("bad expected access"));
throwOccurred = true;
}
BEAST_EXPECT(throwOccurred);
}
// Test error construction from lvalue.
{
auto const err(telLOCAL_ERROR);
auto expected = [&err]() -> Expected<std::string, TER> {
return Unexpected(err);
}();
BEAST_EXPECT(!expected);
BEAST_EXPECT(!expected.has_value());
BEAST_EXPECT(expected.error() == telLOCAL_ERROR);
bool throwOccurred = false;
try
{
// There's no result, so should throw.
[[maybe_unused]] std::size_t const s = expected->size();
}
catch (std::runtime_error const& e)
{
BEAST_EXPECT(e.what() == std::string("bad expected access"));
throwOccurred = true;
}
BEAST_EXPECT(throwOccurred);
}
// Test error construction from const char*.
{
auto const expected = []() -> Expected<int, char const*> {
return Unexpected("Not what is expected!");
}();
BEAST_EXPECT(!expected);
BEAST_EXPECT(!expected.has_value());
BEAST_EXPECT(
expected.error() == std::string("Not what is expected!"));
}
// Test error construction of string from const char*.
{
auto expected = []() -> Expected<int, std::string> {
return Unexpected("Not what is expected!");
}();
BEAST_EXPECT(!expected);
BEAST_EXPECT(!expected.has_value());
BEAST_EXPECT(expected.error() == "Not what is expected!");
std::string const s(std::move(expected.error()));
BEAST_EXPECT(s == "Not what is expected!");
}
// Test non-error const construction of Expected<void, T>.
{
auto const expected = []() -> Expected<void, std::string> {
return {};
}();
BEAST_EXPECT(expected);
bool throwOccurred = false;
try
{
// There's no error, so should throw.
[[maybe_unused]] std::size_t const s = expected.error().size();
}
catch (std::runtime_error const& e)
{
BEAST_EXPECT(e.what() == std::string("bad expected access"));
throwOccurred = true;
}
BEAST_EXPECT(throwOccurred);
}
// Test non-error non-const construction of Expected<void, T>.
{
auto expected = []() -> Expected<void, std::string> {
return {};
}();
BEAST_EXPECT(expected);
bool throwOccurred = false;
try
{
// There's no error, so should throw.
[[maybe_unused]] std::size_t const s = expected.error().size();
}
catch (std::runtime_error const& e)
{
BEAST_EXPECT(e.what() == std::string("bad expected access"));
throwOccurred = true;
}
BEAST_EXPECT(throwOccurred);
}
// Test error const construction of Expected<void, T>.
{
auto const expected = []() -> Expected<void, std::string> {
return Unexpected("Not what is expected!");
}();
BEAST_EXPECT(!expected);
BEAST_EXPECT(expected.error() == "Not what is expected!");
}
// Test error non-const construction of Expected<void, T>.
{
auto expected = []() -> Expected<void, std::string> {
return Unexpected("Not what is expected!");
}();
BEAST_EXPECT(!expected);
BEAST_EXPECT(expected.error() == "Not what is expected!");
std::string const s(std::move(expected.error()));
BEAST_EXPECT(s == "Not what is expected!");
}
}
};
BEAST_DEFINE_TESTSUITE(Expected, ripple_basics, ripple);
} // namespace test
} // namespace ripple