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- const README: rewrite the space-saving claim per issue #5 follow-ups (constant-expression const vs #define immediates; which const qualify as constant expressions) - const README: fix the class-section diagnosis per issue #338 (overload resolution picks the const overload; the restriction only surfaces once that overload is removed) - sizeof README: virtual-inheritance result is compiler-dependent (GCC merges vbptr+vfptr -> 16, MSVC keeps them separate -> 32) #246 - static README: new section on internal linkage / access restriction with anonymous-namespace comparison #142 - 10-day practice: full problem list table + fixed day links #136 - new design_pattern/singleton/singleton_default.hpp: reusable thread-safe CRTP singleton template, compile+concurrency tested #303
70 lines
1.8 KiB
Markdown
70 lines
1.8 KiB
Markdown
> 本文档由 [C++那些事网站](https://light-city.github.io/stories_things/cpp-tools/dbg-macro/) 同步生成，网站版本含多语言与更新排版。
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# C++ dbg-macro 调试宏
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打日志是 C++ 开发中必不可少的一种 debug 方式，dbg-macro 受 Rust 语言中 的 `dbg` 启发，提供比 `printf` 和 `std::cout` 更好的宏函数。主要有如下特点：
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- 美观的彩色输出（当输出不是交互式终端时，颜色将自动禁用）
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- 兼容 C++11，并且是 header-only
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- 支持基础类型和 STL 容器类型的输出
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- 可以输出文件名、行号、函数名和原始表达式
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例如下面的代码：
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```cpp
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#include <vector>
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#include <dbg.h>
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// You can use "dbg(..)" in expressions:
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int factorial(int n) {
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if (dbg(n <= 1)) {
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return dbg(1);
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} else {
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return dbg(n * factorial(n - 1));
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}
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}
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int main() {
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std::string message = "hello";
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dbg(message); // [example.cpp:15 (main)] message = "hello" (std::string)
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const int a = 2;
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const int b = dbg(3 * a) + 1; // [example.cpp:18 (main)] 3 * a = 6 (int)
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std::vector<int> numbers{b, 13, 42};
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dbg(numbers); // [example.cpp:21 (main)] numbers = {7, 13, 42} (size: 3) (std::vector<int>)
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dbg("this line is executed"); // [example.cpp:23 (main)] this line is executed
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factorial(4);
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return 0;
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}
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```
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效果如下：
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## 安装
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```bash
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git clone https://github.com/sharkdp/dbg-macro
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sudo ln -s $(readlink -f dbg-macro/dbg.h) /usr/include/dbg.h
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```
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这样，你就可以在任何地方使用 `dbg.h` 了。
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### 在 Arch Linux 上
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```bash
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yay -S dbg-macro
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```
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### 使用 vcpkg
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```bash
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vcpkg install dbg-macro
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```
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更多内容详见 [官方文档](https://github.com/sharkdp/dbg-macro)。 |