77 lines
2.0 KiB
C++
77 lines
2.0 KiB
C++
#include <iostream>
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#include <cstddef>
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class A {
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private:
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int data[10]; // 模拟对象内部数据
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// 静态成员用于统计
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static size_t createdCount;
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static size_t destroyedCount;
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static size_t totalAllocatedBytes;
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static size_t currentUsedBytes;
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public:
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// 重载 new
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void* operator new(size_t size) {
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createdCount++;
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totalAllocatedBytes += size;
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currentUsedBytes += size;
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std::cout << "[new] size = " << size << std::endl;
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return ::operator new(size);
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}
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// 重载 delete
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void operator delete(void* ptr, size_t size) {
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destroyedCount++;
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currentUsedBytes -= size;
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std::cout << "[delete] size = " << size << std::endl;
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::operator delete(ptr);
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}
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// 重载 new[]
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void* operator new[](size_t size) {
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// 数组内可能含多个对象，加起来计算
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createdCount++; // 注意：这里只统计一次，可更精细统计
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totalAllocatedBytes += size;
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currentUsedBytes += size;
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std::cout << "[new[]] size = " << size << std::endl;
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return ::operator new[](size);
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}
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// 重载 delete[]
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void operator delete[](void* ptr, size_t size) {
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destroyedCount++; // 同上
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currentUsedBytes -= size;
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std::cout << "[delete[]] size = " << size << std::endl;
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::operator delete[](ptr);
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}
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// 统计信息
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static void showStats() {
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std::cout << "Created: " << createdCount << std::endl;
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std::cout << "Destroyed: " << destroyedCount << std::endl;
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std::cout << "Total allocated: " << totalAllocatedBytes << " bytes" << std::endl;
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std::cout << "Current in use: " << currentUsedBytes << " bytes" << std::endl;
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}
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};
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// 静态成员初始化
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size_t A::createdCount = 0;
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size_t A::destroyedCount = 0;
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size_t A::totalAllocatedBytes = 0;
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size_t A::currentUsedBytes = 0;
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int main() {
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A* a1 = new A;
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A* a2 = new A;
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delete a1;
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A* arr = new A[3];
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delete[] arr;
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A::showStats();
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return 0;
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}
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