ss >> boolalpha >> igb.do_rectify;
时间: 2023-12-19 17:06:26 浏览: 27
这行代码使用了流操作符(>>)和 boolalpha 操纵符。它的作用是将 igb.do_rectify 变量的值从流中读取,并将其解析为一个布尔值。
boolalpha 操纵符是用于修改流的格式标志之一。它的作用是将布尔值输出为 true/false 字符串,而不是 1/0。
因此,这行代码的功能是将输入流中的值解析为 igb.do_rectify 的布尔值,并将其存储在 igb.do_rectify 变量中。
相关问题
std::remove_reference_t<T>
std::remove_reference_t<T>是一个模板类型别名,用于移除类型T的引用修饰符。它的实现是通过std::remove_reference模板类的type成员来实现的。\[1\]具体的实现代码如下所示:
```cpp
template <class T>
using remove_reference_t = typename remove_reference<T>::type;
```
这个模板类型别名可以用于移除类型T的引用修饰符,例如将T&转换为T,将T&&转换为T。\[2\]下面是一个使用std::remove_reference_t的示例代码:
```cpp
#include <iostream>
#include <type_traits>
template<class T1, class T2>
void print_is_same() {
std::cout << std::is_same<T1, T2>() << '\n';
}
int main() {
std::cout << std::boolalpha;
print_is_same<int, int>();
print_is_same<int, int&>();
print_is_same<int, int&&>();
print_is_same<int, std::remove_reference<int>::type>();
print_is_same<int, std::remove_reference<int&>::type>();
print_is_same<int, std::remove_reference<int&&>::type>();
}
```
这段代码使用了std::remove_reference_t来比较不同类型之间是否相同。\[3\]
#### 引用[.reference_title]
- *1* *3* [c++14 remove_reference_t 引用移除](https://blog.csdn.net/TH_NUM/article/details/95379955)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^control,239^v3^insert_chatgpt"}} ] [.reference_item]
- *2* [C++学习笔记:右值引用,移动和转发](https://blog.csdn.net/iuices/article/details/122530402)[target="_blank" data-report-click={"spm":"1018.2226.3001.9630","extra":{"utm_source":"vip_chatgpt_common_search_pc_result","utm_medium":"distribute.pc_search_result.none-task-cask-2~all~insert_cask~default-1-null.142^v91^control,239^v3^insert_chatgpt"}} ] [.reference_item]
[ .reference_list ]
contains<>
`contains<>` is a type trait in C++ that checks if a type pack contains a specific type. It is defined in the `<type_traits>` header.
Here is an example usage of `contains<>`:
```c++
#include <iostream>
#include <type_traits>
template<typename... Args>
struct MyStruct {
static constexpr bool has_int = std::disjunction_v<std::is_same<int, Args>...>;
};
int main() {
std::cout << std::boolalpha;
std::cout << MyStruct<char, bool, float>::has_int << '\n'; // false
std::cout << MyStruct<char, bool, int, float>::has_int << '\n'; // true
return 0;
}
```
In this example, `MyStruct` is a class template that takes a variadic pack of types. The `has_int` member variable is a `bool` that indicates whether the pack contains the type `int`.
The `std::is_same` trait is used to check for equality between types, and the `std::disjunction` trait is used to combine the results of multiple `std::is_same` checks into a single `bool` value. The `std::disjunction_v` alias is a shorthand for calling `std::disjunction::value`.