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// Range v3 library
//
// Copyright Eric Niebler 2015-present
//
// Use, modification and distribution is subject to 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)
//
// Project home: https://github.com/ericniebler/range-v3
#include <vector>
#include <sstream>
#include <iostream>
#include <range/v3/functional/overload.hpp>
#include <range/v3/numeric/accumulate.hpp>
#include <range/v3/utility/variant.hpp>
#include <range/v3/view/concat.hpp>
#include <range/v3/view/partial_sum.hpp>
#include <range/v3/view/transform.hpp>
#include "../simple_test.hpp"
#include "../test_utils.hpp"
void bug_1217()
{
std::vector<int> vec;
if(auto tx = vec | ranges::views::transform( [](int){ return 0; } ))
{
auto positions_visited = ranges::views::concat( tx, tx ) | ranges::views::partial_sum;
ranges::accumulate( positions_visited, 0 );
}
}
int main()
{
using namespace ranges;
// Simple variant and access.
{
variant<int, short> v;
CHECK(v.index() == 0u);
auto v2 = v;
CHECK(v2.index() == 0u);
v.emplace<1>((short)2);
CHECK(v.index() == 1u);
CHECK(get<1>(v) == (short)2);
try
{
get<0>(v);
CHECK(false);
}
catch(const bad_variant_access&)
{}
catch(...)
{
CHECK(!(bool)"unknown exception");
}
v = v2;
CHECK(v.index() == 0u);
}
// variant of void
{
variant<void, void> v;
CHECK(v.index() == 0u);
v.emplace<0>();
CHECK(v.index() == 0u);
try
{
// Will only compile if get returns void
v.index() == 0 ? void() : get<0>(v);
}
catch(...)
{
CHECK(false);
}
v.emplace<1>();
CHECK(v.index() == 1u);
try
{
get<0>(v);
CHECK(false);
}
catch(const bad_variant_access&)
{}
catch(...)
{
CHECK(!(bool)"unknown exception");
}
}
// variant of references
{
int i = 42;
std::string s = "hello world";
variant<int&, std::string&> v{emplaced_index<0>, i};
CPP_assert(!default_constructible<variant<int&, std::string&>>);
CHECK(v.index() == 0u);
CHECK(get<0>(v) == 42);
CHECK(&get<0>(v) == &i);
auto const & cv = v;
get<0>(cv) = 24;
CHECK(i == 24);
v.emplace<1>(s);
CHECK(v.index() == 1u);
CHECK(get<1>(v) == "hello world");
CHECK(&get<1>(v) == &s);
get<1>(cv) = "goodbye";
CHECK(s == "goodbye");
}
// Move test 1
{
variant<int, MoveOnlyString> v{emplaced_index<1>, "hello world"};
CHECK(get<1>(v) == "hello world");
MoveOnlyString s = get<1>(std::move(v));
CHECK(s == "hello world");
CHECK(get<1>(v) == "");
v.emplace<1>("goodbye");
CHECK(get<1>(v) == "goodbye");
auto v2 = std::move(v);
CHECK(get<1>(v2) == "goodbye");
CHECK(get<1>(v) == "");
v = std::move(v2);
CHECK(get<1>(v) == "goodbye");
CHECK(get<1>(v2) == "");
}
// Move test 2
{
MoveOnlyString s = "hello world";
variant<MoveOnlyString&> v{emplaced_index<0>, s};
CHECK(get<0>(v) == "hello world");
MoveOnlyString &s2 = get<0>(std::move(v));
CHECK(&s2 == &s);
}
// Apply test 1
{
std::stringstream sout;
variant<int, std::string> v{emplaced_index<1>, "hello"};
auto fun = overload(
[&sout](int&) {sout << "int";},
[&sout](std::string&)->int {sout << "string"; return 42;});
variant<void, int> x = v.visit(fun);
CHECK(sout.str() == "string");
CHECK(x.index() == 1u);
CHECK(get<1>(x) == 42);
}
// Apply test 2
{
std::stringstream sout;
std::string s = "hello";
variant<int, std::string&> const v{emplaced_index<1>, s};
auto fun = overload(
[&sout](int const&) {sout << "int";},
[&sout](std::string&)->int {sout << "string"; return 42;});
variant<void, int> x = v.visit(fun);
CHECK(sout.str() == "string");
CHECK(x.index() == 1u);
CHECK(get<1>(x) == 42);
}
// constexpr variant
{
constexpr variant<int, short> v{emplaced_index<1>, (short)2};
static_assert(v.index() == 1,"");
static_assert(v.valid(),"");
}
// Variant and arrays
{
variant<int[5], std::vector<int>> v{emplaced_index<0>, {1,2,3,4,5}};
int (&rgi)[5] = get<0>(v);
check_equal(rgi, {1,2,3,4,5});
variant<int[5], std::vector<int>> v2{emplaced_index<0>, {}};
int (&rgi2)[5] = get<0>(v2);
check_equal(rgi2, {0,0,0,0,0});
v2 = v;
check_equal(rgi2, {1,2,3,4,5});
struct T
{
T() = delete;
T(int) {}
T(T const &) = default;
T &operator=(T const &) = default;
};
// Should compile and not assert at runtime.
variant<T[5]> vrgt{emplaced_index<0>, {T{42},T{42},T{42},T{42},T{42}}};
(void) vrgt;
}
return ::test_result();
}
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