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#include <type_traits>
#include "catch.hpp"
#include <mapbox/variant_io.hpp>
struct add_visitor
{
add_visitor() {}
template <typename A, typename B>
double operator()(A a, B b) const
{
return a + b;
}
};
TEST_CASE("const binary visitor works on const variants" NAME_EXT, "[visitor][binary visitor]")
{
const variant_type a{7};
const variant_type b = 3;
const variant_type c{7.1};
const variant_type d = 2.9;
const add_visitor v;
REQUIRE(mapbox::util::apply_visitor(v, a, b) == Approx(10));
REQUIRE(mapbox::util::apply_visitor(v, c, d) == Approx(10));
REQUIRE(mapbox::util::apply_visitor(v, a, c) == Approx(14.1));
REQUIRE(mapbox::util::apply_visitor(v, a, d) == Approx(9.9));
REQUIRE(mapbox::util::apply_visitor(v, b, a) == Approx(10));
REQUIRE(mapbox::util::apply_visitor(v, d, c) == Approx(10));
REQUIRE(mapbox::util::apply_visitor(v, c, a) == Approx(14.1));
REQUIRE(mapbox::util::apply_visitor(v, d, a) == Approx(9.9));
}
TEST_CASE("non-const binary visitor works on const variants" NAME_EXT, "[visitor][binary visitor]")
{
const variant_type a = 7;
const variant_type b = 3;
const variant_type c = 7.1;
const variant_type d = 2.9;
add_visitor v;
REQUIRE(mapbox::util::apply_visitor(v, a, b) == Approx(10));
REQUIRE(mapbox::util::apply_visitor(v, c, d) == Approx(10));
REQUIRE(mapbox::util::apply_visitor(v, a, c) == Approx(14.1));
REQUIRE(mapbox::util::apply_visitor(v, a, d) == Approx(9.9));
REQUIRE(mapbox::util::apply_visitor(v, b, a) == Approx(10));
REQUIRE(mapbox::util::apply_visitor(v, d, c) == Approx(10));
REQUIRE(mapbox::util::apply_visitor(v, c, a) == Approx(14.1));
REQUIRE(mapbox::util::apply_visitor(v, d, a) == Approx(9.9));
}
TEST_CASE("const binary visitor works on non-const variants" NAME_EXT, "[visitor][binary visitor]")
{
variant_type a = 7;
variant_type b = 3;
variant_type c = 7.1;
variant_type d = 2.9;
const add_visitor v;
REQUIRE(mapbox::util::apply_visitor(v, a, b) == Approx(10));
REQUIRE(mapbox::util::apply_visitor(v, c, d) == Approx(10));
REQUIRE(mapbox::util::apply_visitor(v, a, c) == Approx(14.1));
REQUIRE(mapbox::util::apply_visitor(v, a, d) == Approx(9.9));
REQUIRE(mapbox::util::apply_visitor(v, b, a) == Approx(10));
REQUIRE(mapbox::util::apply_visitor(v, d, c) == Approx(10));
REQUIRE(mapbox::util::apply_visitor(v, c, a) == Approx(14.1));
REQUIRE(mapbox::util::apply_visitor(v, d, a) == Approx(9.9));
}
TEST_CASE("non-const binary visitor works on non-const variants" NAME_EXT, "[visitor][binary visitor]")
{
variant_type a = 7;
variant_type b = 3;
variant_type c = 7.1;
variant_type d = 2.9;
add_visitor v;
REQUIRE(mapbox::util::apply_visitor(v, a, b) == Approx(10));
REQUIRE(mapbox::util::apply_visitor(v, c, d) == Approx(10));
REQUIRE(mapbox::util::apply_visitor(v, a, c) == Approx(14.1));
REQUIRE(mapbox::util::apply_visitor(v, a, d) == Approx(9.9));
REQUIRE(mapbox::util::apply_visitor(v, b, a) == Approx(10));
REQUIRE(mapbox::util::apply_visitor(v, d, c) == Approx(10));
REQUIRE(mapbox::util::apply_visitor(v, c, a) == Approx(14.1));
REQUIRE(mapbox::util::apply_visitor(v, d, a) == Approx(9.9));
}
TEST_CASE("rvalue binary visitor works on const variants" NAME_EXT, "[visitor][binary visitor]")
{
const variant_type a = 7;
const variant_type b = 3;
const variant_type c = 7.1;
const variant_type d = 2.9;
REQUIRE(mapbox::util::apply_visitor(add_visitor{}, a, b) == Approx(10));
REQUIRE(mapbox::util::apply_visitor(add_visitor{}, c, d) == Approx(10));
REQUIRE(mapbox::util::apply_visitor(add_visitor{}, a, c) == Approx(14.1));
REQUIRE(mapbox::util::apply_visitor(add_visitor{}, a, d) == Approx(9.9));
REQUIRE(mapbox::util::apply_visitor(add_visitor{}, b, a) == Approx(10));
REQUIRE(mapbox::util::apply_visitor(add_visitor{}, d, c) == Approx(10));
REQUIRE(mapbox::util::apply_visitor(add_visitor{}, c, a) == Approx(14.1));
REQUIRE(mapbox::util::apply_visitor(add_visitor{}, d, a) == Approx(9.9));
}
struct sum_mul_visitor
{
double sum;
sum_mul_visitor() : sum(0.0) {}
template <typename A, typename B>
double operator()(A a, B b)
{
double m = a * b;
sum += m;
return m;
}
};
TEST_CASE("mutable binary visitor works" NAME_EXT, "[visitor][binary visitor]")
{
const variant_type a = 2;
const variant_type b = 3;
const variant_type c = 0.1;
const variant_type d = 0.2;
sum_mul_visitor v;
REQUIRE(mapbox::util::apply_visitor(v, a, b) == Approx(6));
REQUIRE(mapbox::util::apply_visitor(v, c, d) == Approx(0.02));
REQUIRE(mapbox::util::apply_visitor(v, a, c) == Approx(0.2));
REQUIRE(mapbox::util::apply_visitor(v, a, d) == Approx(0.4));
REQUIRE(v.sum == Approx(6.62));
REQUIRE(mapbox::util::apply_visitor(v, b, a) == Approx(6));
REQUIRE(mapbox::util::apply_visitor(v, d, c) == Approx(0.02));
REQUIRE(mapbox::util::apply_visitor(v, c, a) == Approx(0.2));
REQUIRE(mapbox::util::apply_visitor(v, d, a) == Approx(0.4));
}
struct swap_visitor
{
swap_visitor(){};
template <typename A, typename B>
void operator()(A& a, B& b) const
{
using T = typename std::common_type<A, B>::type;
T tmp = a;
a = static_cast<A>(b);
b = static_cast<B>(tmp);
}
};
TEST_CASE("static mutating visitor on mutable variants works" NAME_EXT, "[visitor][binary visitor]")
{
variant_type a = 2;
variant_type b = 3;
variant_type c = 0.1;
variant_type d = 0.2;
const swap_visitor v;
SECTION("swap a and b")
{
mapbox::util::apply_visitor(v, a, b);
REQUIRE(a.get<int>() == 3);
REQUIRE(b.get<int>() == 2);
}
SECTION("swap c and d")
{
mapbox::util::apply_visitor(v, c, d);
REQUIRE(c.get<double>() == Approx(0.2));
REQUIRE(d.get<double>() == Approx(0.1));
}
SECTION("swap a and c")
{
mapbox::util::apply_visitor(v, a, c);
REQUIRE(a.get<int>() == 0);
REQUIRE(c.get<double>() == Approx(2.0));
}
SECTION("swap c and a")
{
mapbox::util::apply_visitor(v, c, a);
REQUIRE(a.get<int>() == 0);
REQUIRE(c.get<double>() == Approx(2.0));
}
}
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