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打日志是 C++ 开发中必不可少的一种 debug 方式,[dbg-macro](https://github.com/sharkdp/dbg-macro) 受 [rust-lang](https://www.rust-lang.org) 中 的 [dbg](https://doc.rust-lang.org/std/macro.dbg.html) 启发,提供比 printf 和 std::cout 更好的宏函数。主要有如下特点:
- 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)
- 兼容 C++11,并且是 header-only
- 支持基础类型和 STL 容器类型的输出
- 除了基本信息外,还输出变量名和类型
- 启用 DBG_MACRO_DISABLE 生成 release 版
```c++
#include <vector>
#include <dbg.h>
// You can use "dbg(..)" in expressions:
int factorial(int n) {
if (dbg(n <= 1)) {
return dbg(1);
} else {
return dbg(n * factorial(n - 1));
}
}
int main() {
std::string message = "hello";
dbg(message); // [example.cpp:15 (main)] message = "hello" (std::string)
const int a = 2;
const int b = dbg(3 * a) + 1; // [example.cpp:18 (main)] 3 * a = 6 (int)
std::vector<int> numbers{b, 13, 42};
dbg(numbers); // [example.cpp:21 (main)] numbers = {7, 13, 42} (size: 3) (std::vector<int>)
dbg("this line is executed"); // [example.cpp:23 (main)] this line is executed
factorial(4);
return 0;
}
```
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