#include <cmath>
#include <string>
#include <iostream>
#include <fstream>
#include <windows.h>
#include <vector>
#include <iomanip>
#include <sstream>
#include <set>

double pi(int n) { return n == 0 ? 4 : 4 * pow(-1, n) / (2.0 * n + 1.0) + pi(n - 1); }

class CIniWriter {
private:
    void AppendNewline(std::string szSection) {
        if (!m_vecUsedCategories.empty() && m_vecUsedCategories.find(szSection) == m_vecUsedCategories.end()) {
            m_vecUsedCategories.emplace(szSection);
            m_sFileStream.seekp(0, std::ios_base::end);
            m_sFileStream << "\n";
            m_sFileStream.seekp(0, std::ios_base::end);
        }
    }

public:
    CIniWriter(std::string szFileName) {
        m_szFileName = szFileName;
        m_sFileStream = std::ofstream(szFileName);
    }

    template<typename T> void WriteValue(std::string szSection, std::string szKey, T tValue, bool hex = false) {
        AppendNewline(szSection);
        std::string val;
        if constexpr (std::is_same_v<T, const char*> || std::is_same_v<T, std::string>)
            val = tValue;
        else
            val = std::to_string(tValue);
        if constexpr (std::is_same_v<T, int>) {
            std::stringstream vss;
            vss << (hex ? std::hex : std::dec) << (hex ? "0x" : "") << tValue;
            val = vss.str();
        }
        WritePrivateProfileString(szSection.c_str(), szKey.c_str(), val.c_str(), m_szFileName.c_str());
    }

private:
    std::string m_szFileName;
    std::set<std::string> m_vecUsedCategories;
    std::ofstream m_sFileStream;
};

int main() {
    auto writer = CIniWriter("C:/Users/M/Desktop/test.ini");
    writer.WriteValue("Category", "Bool1", true);
    writer.WriteValue("Category", "Int1", 100);
    writer.WriteValue("Category", "Int2", 100, true);
    writer.WriteValue("Category2", "Bool1", false);
    writer.WriteValue("Category2", "Str1", "roflcopter");
    return 0;
}