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C++静态成员与静态方法

C++静态成员与静态方法

静态成员属于类本身而不是类的实例,所有对象共享同一份静态成员。静态方法只能访问静态成员,不能访问非静态成员。

静态数据成员在所有对象之间共享,用于存储类级别的信息。

#include
#include
#include

class Counter {
static int count_;
int id_;

public:
Counter() : id_(++count_) {
std::cout << "Counter " << id_ << " created, total: " << count_ << "\n";
}

~Counter() {
--count_;
std::cout << "Counter " << id_ << " destroyed, remaining: " << count_ << "\n";
}

static int get_count() {
return count_;
}

int id() const { return id_; }
};

int Counter::count_ = 0;

void static_member_example() {
Counter c1;
Counter c2;
{
Counter c3;
std::cout << "Total counters: " << Counter::get_count() << "\n";
}
std::cout << "After scope: " << Counter::get_count() << "\n";
}

静态方法不需要对象实例即可调用,常用于工厂方法和工具函数。

class MathUtils {
public:
static int add(int a, int b) {
return a + b;
}

static int multiply(int a, int b) {
return a * b;
}

static double power(double base, int exp) {
double result = 1.0;
for (int i = 0; i < exp; ++i) {
result *= base;
}
return result;
}
};

void static_method_example() {
int sum = MathUtils::add(10, 20);
int product = MathUtils::multiply(5, 6);
double pow_result = MathUtils::power(2.0, 10);

std::cout << "Sum: " << sum << "\n";
std::cout << "Product: " << product << "\n";
std::cout << "Power: " << pow_result << "\n";
}

静态成员可以实现单例模式,确保类只有一个实例。

class Logger {
static Logger* instance_;
std::string log_file_;

Logger(const std::string& file) : log_file_(file) {
std::cout << "Logger initialized with file: " << file << "\n";
}

public:
static Logger* get_instance() {
if (!instance_) {
instance_ = new Logger("app.log");
}
return instance_;
}

void log(const std::string& message) {
std::cout << "[" << log_file_ << "] " << message << "\n";
}

Logger(const Logger&) = delete;
Logger& operator=(const Logger&) = delete;
};

Logger* Logger::instance_ = nullptr;

void singleton_example() {
Logger::get_instance()->log("Application started");
Logger::get_instance()->log("Processing data");
}

静态常量成员可以在类内初始化。

class Config {
public:
static const int MAX_CONNECTIONS = 100;
static const double TIMEOUT = 30.0;
static constexpr int BUFFER_SIZE = 1024;
};

void static_const_example() {
std::cout << "Max connections: " << Config::MAX_CONNECTIONS << "\n";
std::cout << "Timeout: " << Config::TIMEOUT << "\n";
std::cout << "Buffer size: " << Config::BUFFER_SIZE << "\n";
}

静态成员函数可以作为回调函数使用。

class EventHandler {
static int event_count_;

public:
static void on_event(int event_id) {
++event_count_;
std::cout << "Event " << event_id << " handled, total: " << event_count_ << "\n";
}

static int get_event_count() {
return event_count_;
}
};

int EventHandler::event_count_ = 0;

void callback_example() {
EventHandler::on_event(1);
EventHandler::on_event(2);
EventHandler::on_event(3);
std::cout << "Total events: " << EventHandler::get_event_count() << "\n";
}

静态成员可以用于实现对象池。

template
class ObjectPool {
static std::vector pool_;
static const size_t MAX_SIZE = 10;

public:
static T* acquire() {
if (!pool_.empty()) {
T* obj = pool_.back();
pool_.pop_back();
std::cout << "Reusing object from pool\n";
return obj;
}
std::cout << "Creating new object\n";
return new T();
}

static void release(T* obj) {
if (pool_.size() < MAX_SIZE) {
pool_.push_back(obj);
std::cout << "Returning object to pool\n";
} else {
delete obj;
std::cout << "Pool full, deleting object\n";
}
}

static size_t pool_size() {
return pool_.size();
}
};

template
std::vector ObjectPool::pool_;

class Resource {
public:
Resource() {
std::cout << "Resource constructed\n";
}
~Resource() {
std::cout << "Resource destroyed\n";
}
};

void object_pool_example() {
Resource* r1 = ObjectPool::acquire();
Resource* r2 = ObjectPool::acquire();

ObjectPool::release(r1);
ObjectPool::release(r2);

Resource* r3 = ObjectPool::acquire();
ObjectPool::release(r3);
}

静态成员是C++中实现类级别功能的重要工具,理解其生命周期和访问规则对于正确使用至关重要。


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