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// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <vector>
#include "base/containers/span.h"
// Test the frontier change are applied correctly. Below, there are 3 kinds of
// frontiers, but only 1 of them is spanified.
// ┌──────────────────┐
// │spanified_2 │
// └▲────────────────▲┘
// ┌───────┴───────┐┌───────┴───────┐
// │not_spanified_2││spanified_1 (*)│ (* = buffer usage)
// └▲──────────────┘└───────────────┘
// ┌┴──────────────┐
// │not_spanified_1│
// └───────────────┘
void test_frontier_basic() {
std::vector<int> buf(5, 5);
// Expected rewrite:
// base::span<int> spanified_2 = buf;
base::span<int> spanified_2 = buf;
// Expected rewrite:
// base::span<int> spanified_1 = spanified_2;
base::span<int> spanified_1 = spanified_2; // Expect: frontier not applied.
// Expected rewrite:
// int* not_spanified_2 = spanified_2.data();
int* not_spanified_2 = spanified_2.data(); // Expect: frontier applied
int* not_spanified_1 = not_spanified_2; // Expect: frontier not applied.
spanified_1[0] = 0;
}
// Test the case that the arrow operator is used instead of the dot operator.
// The lhs of the operator is a pointer, so we need to dereference it.
void test_frontier_basic2() {
std::vector<int> buf(5, 5);
std::vector<int>* buf_ptr;
// Expected rewrite:
// base::span<int> spanified_2 = *buf_ptr;
base::span<int> spanified_2 = *buf_ptr;
// Expected rewrite:
// base::span<int> spanified_1 = spanified_2;
base::span<int> spanified_1 = spanified_2;
spanified_1[0] = 0;
}
// Test the case that the arrow operator is used instead of the dot operator.
// The lhs of the operator can be a non-simple expression, e.g. a function call.
void test_frontier_basic3() {
extern std::vector<int>* func();
// Expected rewrite:
// base::span<int> spanified_2 = *func();
base::span<int> spanified_2 = *func();
// Expected rewrite:
// base::span<int> spanified_1 = spanified_2;
base::span<int> spanified_1 = spanified_2;
spanified_1[0] = 0;
}
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