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// SPDX-FileCopyrightText: 2025 Kohei Yoshida
//
// SPDX-License-Identifier: MIT
#include <vector>
#include <boost/pool/object_pool.hpp>
#include <iostream>
#include <stdio.h>
#include <string>
#include <sys/time.h>
namespace {
class StackPrinter
{
public:
explicit StackPrinter(const char* msg) : msMsg(msg)
{
fprintf(stdout, "%s: --begin\n", msMsg.c_str());
mfStartTime = getTime();
}
~StackPrinter()
{
double fEndTime = getTime();
fprintf(stdout, "%s: --end (duration: %g sec)\n", msMsg.c_str(), (fEndTime - mfStartTime));
}
void printTime(int line) const
{
double fEndTime = getTime();
fprintf(stdout, "%s: --(%d) (duration: %g sec)\n", msMsg.c_str(), line, (fEndTime - mfStartTime));
}
private:
double getTime() const
{
timeval tv;
gettimeofday(&tv, nullptr);
return tv.tv_sec + tv.tv_usec / 1000000.0;
}
::std::string msMsg;
double mfStartTime;
};
} // namespace
using namespace std;
using ::boost::object_pool;
struct element
{
double number;
element() : number(0.0)
{}
element(double num) : number(num)
{}
};
int main()
{
size_t n = 100000000;
{
StackPrinter __stack_printer__("::main object pool with vector");
object_pool<element> elem_pool;
vector<element*> vec;
vec.reserve(n);
for (size_t i = 0; i < n; ++i)
vec.push_back(elem_pool.construct());
cout << "size of vector: " << vec.size() << endl;
}
{
StackPrinter __stack_printer__("::main array new");
element* parray = new element[n];
for (size_t i = 0; i < n; ++i)
parray[i].number = 1.0;
cout << "size of array: " << sizeof(parray) / sizeof(element) << endl;
delete[] parray;
}
return 0;
}
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