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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
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1.8 KiB
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C++ dbg-macro 调试宏
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：
- 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
- 可以输出文件名、行号、函数名和原始表达式
例如下面的代码：
#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;
}
效果如下：
安装
git clone https://github.com/sharkdp/dbg-macro
sudo ln -s $(readlink -f dbg-macro/dbg.h) /usr/include/dbg.h
这样，你就可以在任何地方使用 dbg.h 了。
在 Arch Linux 上
yay -S dbg-macro
使用 vcpkg
vcpkg install dbg-macro
更多内容详见 官方文档。