test/span_test.cpp

/*
 * Copyright 2022 Rive
 */

#include <rive/span.hpp>
#include <catch.hpp>
#include <cstdio>
#include <vector>

using namespace rive;

TEST_CASE("basics", "[span]")
{
    Span<int> span;
    REQUIRE(span.empty());
    REQUIRE(span.size() == 0);
    REQUIRE(span.size_bytes() == 0);
    REQUIRE(span.begin() == span.end());

    int array[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};

    span = {array, 4};
    REQUIRE(!span.empty());
    REQUIRE(span.data() == array);
    REQUIRE(span.size() == 4);
    REQUIRE(span.size_bytes() == 4 * sizeof(int));
    REQUIRE(span.begin() + span.size() == span.end());

    int counter = 0;
    int sum = 0;
    for (auto s : span)
    {
        counter += 1;
        sum += s;
    }
    REQUIRE(counter == 4);
    REQUIRE(sum == 0 + 1 + 2 + 3);

    auto sub = span.subset(1, 2);
    REQUIRE(!sub.empty());
    REQUIRE(sub.data() == array + 1);
    REQUIRE(sub.size() == 2);

    sub = sub.subset(1, 0);
    REQUIRE(sub.empty());
    REQUIRE(sub.size() == 0);
}

static void funca(Span<int> span) {}
static void funcb(Span<const int> span) {}

TEST_CASE("const-and-containers", "[span]")
{
    const int carray[] = {1, 2, 3, 4};
    funcb({carray, 4});

    int array[] = {1, 2, 3, 4};
    funca({array, 4});
    funcb({array, 4});

    std::vector<int> v;
    funca(v);
    funcb(v);
}

TEST_CASE("can iterate span", "[span]")
{
    const int carray[] = {2, 4, 8, 16};

    auto span = make_span(carray, 4);
    int expect = 2;
    for (auto value : span)
    {
        REQUIRE(value == expect);
        expect *= 2;
    }
}