#include <cstdio>
#include <string>
#include <filesystem>

namespace fs = std::filesystem;

namespace os {
    const char* path_separator() { return "\\"; }
}

const char java_home[] = "B:\\java\\mc\\builds\\windows-x86_64-mc-release-skylake-x";

int main() {
    auto fprintln = [](const std::string& str) {
        printf("%s\n", str.c_str());
    };

    fs::path overrideRoot = java_home;
    fprintln(overrideRoot.string());
    overrideRoot /= "override";
    fprintln(overrideRoot.string());
    fs::directory_entry overrideDir{ overrideRoot };
    if (overrideDir.is_directory()) {
        using iterator = fs::recursive_directory_iterator;
        for (iterator iter{ overrideDir }; iter != iterator(); ++iter) {
            // works fine
            const auto & override = *iter;
            fprintln(override.path().string());
            if (override.exists() && !override.is_directory()) {
                std::string overridePath = override.path().string();
                fprintln(overridePath);
            }
        }
        for (const auto & override : iterator{ overrideDir }) {
            // works fine
            fprintln(override.path().string());
            if (override.exists() && !override.is_directory()) {
                std::string overridePath = override.path().string();
                fprintln(overridePath);
            }
        }
        for (const auto & override : iterator( overrideDir )) {
            // doesn't enter
            if (override.exists() && !override.is_directory()) {
                std::string overridePath = override.path().string();
                puts(overridePath.c_str());
            }
        }
    }
}