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Mar 30, 2024 Replied to a topic by WangLiCha 程序员 已知两个相交的 polyline 的坐标点集合，怎么求交点的精确坐标？坐标点不在点集里 |
Oct 30, 2023 Replied to a topic by FH0 C++ 熟悉函数式和 C++ 的老哥有偿帮忙解决个问题 |
```cpp
struct Command
{
std::string msg;
std::string description;
bool require;
std::function<void(std::any)> command;
void exec(std::any v)
{
if (command)
command(v);
}
};
class Args
{
public:
Args *add_opt(Command *command)
{
commandMap[command->msg] = command;
return this;
}
void parse(int argc, char *argv[])
{
// do parse....
std::map<std::string, std::any> valueMap;
for (auto &[key, value] : commandMap) {
if(valueMap.find(key) != valueMap.end()) {
value->exec(valueMap[key]);
} else {
if(value->require) {
// require but not found
}
}
}
}
std::map<std::string, Command *> commandMap;
};
Args *args = new Args();
args->add_opt(
new Command{"-p", "port", true, [](std::any v) { std::cout << std::any_cast<int>(v); }})
->add_opt(new Command())
->add_opt(new Command())
->add_opt(new Command())
->add_opt(new Command());
```
struct Command
{
std::string msg;
std::string description;
bool require;
std::function<void(std::any)> command;
void exec(std::any v)
{
if (command)
command(v);
}
};
class Args
{
public:
Args *add_opt(Command *command)
{
commandMap[command->msg] = command;
return this;
}
void parse(int argc, char *argv[])
{
// do parse....
std::map<std::string, std::any> valueMap;
for (auto &[key, value] : commandMap) {
if(valueMap.find(key) != valueMap.end()) {
value->exec(valueMap[key]);
} else {
if(value->require) {
// require but not found
}
}
}
}
std::map<std::string, Command *> commandMap;
};
Args *args = new Args();
args->add_opt(
new Command{"-p", "port", true, [](std::any v) { std::cout << std::any_cast<int>(v); }})
->add_opt(new Command())
->add_opt(new Command())
->add_opt(new Command())
->add_opt(new Command());
```
Oct 30, 2023 Replied to a topic by FH0 C++ 熟悉函数式和 C++ 的老哥有偿帮忙解决个问题 |
@FH0 你想要这样只要在 add_option 返回 return this 不就好了
Oct 29, 2023 Replied to a topic by bugmaker1024 NVIDIA NVIDIA Jetson Linux 35.4.1 安装 qt4 有朋友实践吗？ |
搞过一次 Jetson TX2 Qt5 的： [交叉编译 Qt5 armv8(aarch64) with WebEngine - NVIDIA JETSON TX2]( https://zekexiao.com/cross-build-qt5-aarch64-with-webengine)
Jul 6, 2023 Replied to a topic by chenjia404 奇思妙想 让自己的博客永存的思路 |
Oct 11, 2022 Replied to a topic by tracker647 C++ WebServer 异步日志模块， Log 类构析导致线程死锁, 不知如何解除异步线程阻塞 |
@tracker647 应该先 `m_is_async = false;` 再 fclose ，而且应该在置 false 后 join thread 等待线程结束，要不可能会 fputs 到 close 的 handle 里。
Sep 5, 2022 Replied to a topic by Windows win11 蛋疼的 bug |
@cweijan Windows 既然提供了移动这几个目录的功能，为什么不能用
Jun 29, 2022 Replied to a topic by ligiggy C++ C++动态内存管理问题求解 |
每组数据就很大了，用之前用 vector.reserve 扩展一下避免分配
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