forked from TartanLlama/expected
94 lines
2.2 KiB
C++
94 lines
2.2 KiB
C++
#include "catch.hpp"
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#include "expected.hpp"
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#include <string>
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using std::string;
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tl::expected<int, string> getInt3(int val) { return val; }
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tl::expected<int, string> getInt2(int val) { return val; }
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tl::expected<int, string> getInt1() { return getInt2(5).and_then(getInt3); }
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TEST_CASE("Issue 1", "[issues.1]") { getInt1(); }
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tl::expected<int, int> operation1() { return 42; }
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tl::expected<std::string, int> operation2(int const val) { return "Bananas"; }
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TEST_CASE("Issue 17", "[issues.17]") {
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auto const intermediate_result = operation1();
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intermediate_result.and_then(operation2);
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}
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struct a {};
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struct b : a {};
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auto doit() -> tl::expected<std::unique_ptr<b>, int> {
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return tl::make_unexpected(0);
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}
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TEST_CASE("Issue 23", "[issues.23]") {
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tl::expected<std::unique_ptr<a>, int> msg = doit();
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REQUIRE(!msg.has_value());
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}
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TEST_CASE("Issue 26", "[issues.26]") {
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tl::expected<a, int> exp = tl::expected<b, int>(tl::unexpect, 0);
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REQUIRE(!exp.has_value());
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}
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struct foo {
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foo() = default;
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foo(foo &) = delete;
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foo(foo &&){};
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};
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TEST_CASE("Issue 29", "[issues.29]") {
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std::vector<foo> v;
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v.emplace_back();
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tl::expected<std::vector<foo>, int> ov = std::move(v);
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REQUIRE(ov->size() == 1);
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}
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tl::expected<int, std::string> error() {
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return tl::make_unexpected(std::string("error1 "));
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}
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std::string maperror(std::string s) { return s + "maperror "; }
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TEST_CASE("Issue 30", "[issues.30]") {
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error().map_error(maperror);
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}
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struct i31{
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int i;
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};
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TEST_CASE("Issue 31", "[issues.31]") {
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const tl::expected<i31, int> a = i31{42};
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a->i;
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tl::expected< void, std::string > result;
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tl::expected< void, std::string > result2 = result;
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result2 = result;
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}
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TEST_CASE("Issue 33", "[issues.33]") {
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tl::expected<void, int> res {tl::unexpect, 0};
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REQUIRE(!res);
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res = res.map_error([](int i) { return 42; });
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REQUIRE(res.error() == 42);
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}
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tl::expected<void, std::string> voidWork() { return {}; }
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tl::expected<int, std::string> work2() { return 42; }
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void errorhandling(std::string){}
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TEST_CASE("Issue 34", "[issues.34]") {
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tl::expected <int, std::string> result = voidWork ()
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.and_then (work2);
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result.map_error ([&] (std::string result) {errorhandling (result);});
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}
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