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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// This is a "No Compile Test" suite.
// http://dev.chromium.org/developers/testing/no-compile-tests
#include "base/containers/span.h"
#include <array>
#include <set>
#include <vector>
namespace base {
class Base {
};
class Derived : Base {
};
#if defined(NCTEST_DERIVED_TO_BASE_CONVERSION_DISALLOWED) // [r"fatal error: no matching constructor for initialization of 'span<base::Base \*>'"]
// Internally, this is represented as a pointer to pointers to Derived. An
// implicit conversion to a pointer to pointers to Base must not be allowed.
// If it were allowed, then something like this would be possible.
// Cat** cats = GetCats();
// Animals** animals = cats;
// animals[0] = new Dog(); // Uhoh!
void WontCompile() {
span<Derived*> derived_span;
span<Base*> base_span(derived_span);
}
#elif defined(NCTEST_PTR_TO_CONSTPTR_CONVERSION_DISALLOWED) // [r"fatal error: no matching constructor for initialization of 'span<const int \*>'"]
// Similarly, converting a span<int*> to span<const int*> requires internally
// converting T** to const T**. This is also disallowed, as it would allow code
// to violate the contract of const.
void WontCompile() {
span<int*> non_const_span;
span<const int*> const_span(non_const_span);
}
#elif defined(NCTEST_STD_ARRAY_CONVERSION_DISALLOWED) // [r"fatal error: no matching constructor for initialization of 'span<int>'"]
// This isn't implemented today. Maybe it will be some day.
void WontCompile() {
std::array<int, 3> array;
span<int> span(array);
}
#elif defined(NCTEST_CONST_CONTAINER_TO_MUTABLE_CONVERSION_DISALLOWED) // [r"fatal error: no matching constructor for initialization of 'span<int>'"]
// A const container should not be convertible to a mutable span.
void WontCompile() {
const std::vector<int> v = {1, 2, 3};
span<int> span(v);
}
#elif defined(NCTEST_STD_SET_CONVERSION_DISALLOWED) // [r"fatal error: no matching constructor for initialization of 'span<int>'"]
// A std::set() should not satisfy the requirements for conversion to a span.
void WontCompile() {
std::set<int> set;
span<int> span(set);
}
#elif defined(NCTEST_AS_WRITABLE_BYTES_WITH_CONST_CONTAINER_DISALLOWED) // [r"fatal error: no matching function for call to 'as_writable_bytes'"]
// as_writable_bytes should not be possible for a const container.
void WontCompile() {
const std::vector<int> v = {1, 2, 3};
span<uint8_t> bytes = as_writable_bytes(make_span(v));
}
#elif defined(NCTEST_MAKE_SPAN_FROM_SET_CONVERSION_DISALLOWED) // [r"fatal error: no matching function for call to 'make_span'"]
// A std::set() should not satisfy the requirements for conversion to a span.
void WontCompile() {
std::set<int> set;
auto span = make_span(set);
}
#endif
} // namespace base
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