Abseil Common Libraries (C++) (grcp 依赖)
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82 lines
2.5 KiB
82 lines
2.5 KiB
// Copyright 2017 The Abseil Authors. |
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// |
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// Licensed under the Apache License, Version 2.0 (the "License"); |
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// you may not use this file except in compliance with the License. |
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// You may obtain a copy of the License at |
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// |
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// https://www.apache.org/licenses/LICENSE-2.0 |
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// |
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// Unless required by applicable law or agreed to in writing, software |
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// distributed under the License is distributed on an "AS IS" BASIS, |
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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// See the License for the specific language governing permissions and |
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// limitations under the License. |
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#include "absl/strings/internal/resize_uninitialized.h" |
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#include "gtest/gtest.h" |
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namespace { |
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int resize_call_count = 0; |
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// A mock string class whose only purpose is to track how many times its |
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// resize() method has been called. |
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struct resizable_string { |
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size_t size() const { return 0; } |
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char& operator[](size_t) { |
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static char c = '\0'; |
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return c; |
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} |
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void resize(size_t) { resize_call_count += 1; } |
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}; |
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int resize_default_init_call_count = 0; |
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// A mock string class whose only purpose is to track how many times its |
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// resize() and __resize_default_init() methods have been called. |
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struct resize_default_init_string { |
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size_t size() const { return 0; } |
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char& operator[](size_t) { |
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static char c = '\0'; |
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return c; |
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} |
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void resize(size_t) { resize_call_count += 1; } |
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void __resize_default_init(size_t) { resize_default_init_call_count += 1; } |
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}; |
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TEST(ResizeUninit, WithAndWithout) { |
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resize_call_count = 0; |
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resize_default_init_call_count = 0; |
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{ |
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resizable_string rs; |
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EXPECT_EQ(resize_call_count, 0); |
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EXPECT_EQ(resize_default_init_call_count, 0); |
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EXPECT_FALSE( |
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absl::strings_internal::STLStringSupportsNontrashingResize(&rs)); |
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EXPECT_EQ(resize_call_count, 0); |
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EXPECT_EQ(resize_default_init_call_count, 0); |
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absl::strings_internal::STLStringResizeUninitialized(&rs, 237); |
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EXPECT_EQ(resize_call_count, 1); |
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EXPECT_EQ(resize_default_init_call_count, 0); |
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} |
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resize_call_count = 0; |
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resize_default_init_call_count = 0; |
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{ |
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resize_default_init_string rus; |
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EXPECT_EQ(resize_call_count, 0); |
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EXPECT_EQ(resize_default_init_call_count, 0); |
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EXPECT_TRUE( |
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absl::strings_internal::STLStringSupportsNontrashingResize(&rus)); |
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EXPECT_EQ(resize_call_count, 0); |
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EXPECT_EQ(resize_default_init_call_count, 0); |
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absl::strings_internal::STLStringResizeUninitialized(&rus, 237); |
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EXPECT_EQ(resize_call_count, 0); |
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EXPECT_EQ(resize_default_init_call_count, 1); |
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} |
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} |
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} // namespace
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