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// Copyright 2015, Tobias Hermann and the FunctionalPlus contributors.
// https://github.com/Dobiasd/FunctionalPlus
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#define DOCTEST_CONFIG_IMPLEMENT_WITH_MAIN
#include "doctest/doctest.h"
#include <fplus/fplus.hpp>
namespace {
std::string print_output;
bool print_int(int x)
{
print_output = "int " + std::to_string(x);
return true;
}
bool print_double(double x)
{
print_output = "double " + std::to_string(fplus::round(x));
return true;
}
bool print_string(const std::string& str)
{
print_output = "string " + str;
return true;
}
std::string show_int(int x)
{
return fplus::show(x);
}
std::string show_string(const std::string& str)
{
return fplus::show(str);
}
}
TEST_CASE("variant_test, visit_one")
{
using namespace fplus;
fplus::variant<int, double> int_or_double(3);
int_or_double.visit_one(print_int);
REQUIRE_EQ(print_output, "int 3");
print_output.clear();
int_or_double.visit_one(print_double);
REQUIRE_EQ(print_output, "");
print_output.clear();
int_or_double = 23.0;
int_or_double.visit_one(print_int);
REQUIRE_EQ(print_output, "");
print_output.clear();
int_or_double.visit_one(print_double);
REQUIRE_EQ(print_output, "double 23");
print_output.clear();
using float_or_double = fplus::variant<float, double>;
using nested = fplus::variant<int, float_or_double>;
nested int_or_float_double_variant(fplus::variant<float, double>(3.0));
const auto print_nested_double = [&](const float_or_double& f_o_d) -> int
{
f_o_d.visit_one(print_double);
return 0;
};
int_or_float_double_variant.visit_one(print_nested_double);
REQUIRE_EQ(print_output, "double 3");
print_output.clear();
}
TEST_CASE("variant_test, equality_test")
{
using namespace fplus;
fplus::variant<int, std::string> int_or_string_i(3);
fplus::variant<int, std::string> int_or_string_s(std::string("hi"));
REQUIRE(int_or_string_i == int_or_string_i);
REQUIRE_FALSE(int_or_string_i == int_or_string_s);
}
TEST_CASE("variant_test, inequality_test")
{
using namespace fplus;
fplus::variant<int, std::string> int_or_string_i(3);
fplus::variant<int, std::string> int_or_string_s(std::string("hi"));
REQUIRE_FALSE(int_or_string_i != int_or_string_i);
REQUIRE(int_or_string_i != int_or_string_s);
}
TEST_CASE("variant_test, visit")
{
using namespace fplus;
// should not compile
//int_or_double.visit_one<std::string>(print_string);
fplus::variant<int, std::string> int_or_string(3);
REQUIRE(int_or_string.is<int>());
REQUIRE_FALSE(int_or_string.is<std::string>());
int_or_string.visit(print_int, print_string);
REQUIRE_EQ(print_output, "int 3");
print_output.clear();
const auto transform_result =
int_or_string.transform(show_int, show_string);
transform_result.visit_one(print_string);
REQUIRE_EQ(print_output, "string 3");
print_output.clear();
// should not compile
//std::cout << int_or_string.visit(show_int, show_float) << std::endl;
// should not compile
//std::cout << int_or_string.visit(show_int, show_int) << std::endl;
// should not compile
//std::cout << int_or_string.visit(show_int, show_string, show_double) << std::endl;
// should not compile
//std::cout << int_or_string.visit(show_int) << std::endl;
}
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