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Add make_span()

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This patch provides a make_span function to simplify the
creation of spans until C++17 is available. In addition
this patch updates the unit tests to includes tests that
verify this new functionality.
This commit is contained in:
Rian Quinn
2016-11-16 11:17:04 -07:00
committed by Neil MacIntosh
parent 9523c1842e
commit 2df9f85385
2 changed files with 152 additions and 2 deletions
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115
tests/span_tests.cpp
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@@ -204,6 +204,24 @@ SUITE(span_tests)
auto workaround_macro = [=]() { span<int> s{p, 2}; };
CHECK_THROW(workaround_macro(), fail_fast);
}
{
auto s = make_span(&arr[0], 2);
CHECK(s.length() == 2 && s.data() == &arr[0]);
CHECK(s[0] == 1 && s[1] == 2);
}
{
int* p = nullptr;
auto s = make_span(p, static_cast<span<int>::index_type>(0));
CHECK(s.length() == 0 && s.data() == nullptr);
}
{
int* p = nullptr;
auto workaround_macro = [=]() { make_span(p, 2); };
CHECK_THROW(workaround_macro(), fail_fast);
}
}
TEST(from_pointer_pointer_constructor)
@@ -263,6 +281,23 @@ SUITE(span_tests)
// auto workaround_macro = [&]() { span<int> s{&arr[0], p}; };
// CHECK_THROW(workaround_macro(), fail_fast);
//}
{
auto s = make_span(&arr[0], &arr[2]);
CHECK(s.length() == 2 && s.data() == &arr[0]);
CHECK(s[0] == 1 && s[1] == 2);
}
{
auto s = make_span(&arr[0], &arr[0]);
CHECK(s.length() == 0 && s.data() == &arr[0]);
}
{
int* p = nullptr;
auto s = make_span(p, p);
CHECK(s.length() == 0 && s.data() == nullptr);
}
}
TEST(from_array_constructor)
@@ -339,6 +374,21 @@ SUITE(span_tests)
span<int[3][2]> s{&arr3d[0], 1};
CHECK(s.length() == 1 && s.data() == &arr3d[0]);
}
{
auto s = make_span(arr);
CHECK(s.length() == 5 && s.data() == &arr[0]);
}
{
auto s = make_span(&(arr2d[0]), 1);
CHECK(s.length() == 1 && s.data() == &arr2d[0]);
}
{
auto s = make_span(&arr3d[0], 1);
CHECK(s.length() == 1 && s.data() == &arr3d[0]);
}
}
TEST(from_dynamic_array_constructor)
@@ -350,6 +400,11 @@ SUITE(span_tests)
CHECK(s.length() == 10 && s.data() == &arr[0][0][0]);
}
{
auto s = make_span(&arr[0][0][0], 10);
CHECK(s.length() == 10 && s.data() == &arr[0][0][0]);
}
delete[] arr;
}
@@ -408,6 +463,11 @@ SUITE(span_tests)
// try to take a temporary std::array
take_a_span(get_an_array());
}
{
auto s = make_span(arr);
CHECK(s.size() == narrow_cast<ptrdiff_t>(arr.size()) && s.data() == arr.data());
}
}
TEST(from_const_std_array_constructor)
@@ -446,6 +506,11 @@ SUITE(span_tests)
// try to take a temporary std::array
take_a_span(get_an_array());
}
{
auto s = make_span(arr);
CHECK(s.size() == narrow_cast<ptrdiff_t>(arr.size()) && s.data() == arr.data());
}
}
TEST(from_std_array_const_constructor)
@@ -481,6 +546,11 @@ SUITE(span_tests)
span<int, 4> s{arr};
}
#endif
{
auto s = make_span(arr);
CHECK(s.size() == narrow_cast<ptrdiff_t>(arr.size()) && s.data() == arr.data());
}
}
TEST(from_unique_pointer_construction)
@@ -493,6 +563,12 @@ SUITE(span_tests)
CHECK(s.length() == 1 && s.data() == ptr.get());
CHECK(s[0] == 4);
}
{
auto s = make_span(ptr);
CHECK(s.length() == 1 && s.data() == ptr.get());
CHECK(s[0] == 4);
}
}
{
@@ -502,6 +578,11 @@ SUITE(span_tests)
span<int> s{ptr};
CHECK(s.length() == 0 && s.data() == nullptr);
}
{
auto s = make_span(ptr);
CHECK(s.length() == 0 && s.data() == nullptr);
}
}
{
@@ -515,13 +596,24 @@ SUITE(span_tests)
CHECK(s.length() == 4 && s.data() == arr.get());
CHECK(s[0] == 1 && s[1] == 2);
}
{
auto s = make_span(arr, 4);
CHECK(s.length() == 4 && s.data() == arr.get());
CHECK(s[0] == 1 && s[1] == 2);
}
}
{
auto ptr = std::unique_ptr<int[]>{nullptr};
auto arr = std::unique_ptr<int[]>{nullptr};
{
span<int> s{ptr, 0};
span<int> s{arr, 0};
CHECK(s.length() == 0 && s.data() == nullptr);
}
{
auto s = make_span(arr, 0);
CHECK(s.length() == 0 && s.data() == nullptr);
}
}
@@ -537,6 +629,12 @@ SUITE(span_tests)
CHECK(s.length() == 1 && s.data() == ptr.get());
CHECK(s[0] == 4);
}
{
auto s = make_span(ptr);
CHECK(s.length() == 1 && s.data() == ptr.get());
CHECK(s[0] == 4);
}
}
{
@@ -546,6 +644,11 @@ SUITE(span_tests)
span<int> s{ptr};
CHECK(s.length() == 0 && s.data() == nullptr);
}
{
auto s = make_span(ptr);
CHECK(s.length() == 0 && s.data() == nullptr);
}
}
}
@@ -631,6 +734,14 @@ SUITE(span_tests)
span<int> s{m};
#endif
}
{
auto s = make_span(v);
CHECK(s.size() == narrow_cast<std::ptrdiff_t>(v.size()) && s.data() == v.data());
auto cs = make_span(cv);
CHECK(cs.size() == narrow_cast<std::ptrdiff_t>(cv.size()) && cs.data() == cv.data());
}
}
TEST(from_convertible_span_constructor)