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book: formatting style updates (#231)

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This commit is contained in:
ReEcho
2022-07-17 19:29:30 +08:00
committed by GitHub
parent 41b88c861e
commit e50e3c64f2
10 changed files with 104 additions and 74 deletions
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14
book/en-us/05-pointers.md
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@@ -57,27 +57,27 @@ And see the reference count of an object by `use_count()`. E.g:
auto pointer = std::make_shared<int>(10);
auto pointer2 = pointer; // reference count+1
auto pointer3 = pointer; // reference count+1
int *p = pointer.get(); // no increase of reference count
int *p = pointer.get(); // no increase of reference count
std::cout << "pointer.use_count() = " << pointer.use_count() << std::endl; // 3
std::cout << "pointer.use_count() = " << pointer.use_count() << std::endl; // 3
std::cout << "pointer2.use_count() = " << pointer2.use_count() << std::endl; // 3
std::cout << "pointer3.use_count() = " << pointer3.use_count() << std::endl; // 3
pointer2.reset();
std::cout << "reset pointer2:" << std::endl;
std::cout << "pointer.use_count() = " << pointer.use_count() << std::endl; // 2
std::cout << "pointer.use_count() = " << pointer.use_count() << std::endl; // 2
std::cout << "pointer2.use_count() = "
<< pointer2.use_count() << std::endl; // 0, pointer2 has reset
<< pointer2.use_count() << std::endl; // pointer2 has reset, 0
std::cout << "pointer3.use_count() = " << pointer3.use_count() << std::endl; // 2
pointer3.reset();
std::cout << "reset pointer3:" << std::endl;
std::cout << "pointer.use_count() = " << pointer.use_count() << std::endl; // 1
std::cout << "pointer.use_count() = " << pointer.use_count() << std::endl; // 1
std::cout << "pointer2.use_count() = " << pointer2.use_count() << std::endl; // 0
std::cout << "pointer3.use_count() = "
<< pointer3.use_count() << std::endl; // 0, pointer3 has reset
<< pointer3.use_count() << std::endl; // pointer3 has reset, 0
```
## 5.3 `std::unique_ptr`
@@ -85,7 +85,7 @@ std::cout << "pointer3.use_count() = "
`std::unique_ptr` is an exclusive smart pointer that prohibits other smart pointers from sharing the same object, thus keeping the code safe:
```cpp
std::unique_ptr<int> pointer = std::make_unique<int>(10); // make_unique was introduced in C++14
std::unique_ptr<int> pointer = std::make_unique<int>(10); // make_unique, from C++14
std::unique_ptr<int> pointer2 = pointer; // illegal
```