static void test_parent(const fs::path & in, const std::string & out) {
fs::path p = in.parent();
arx_assert_msg(p.string() == out, "\"%s\".parent() -> \"%s\" != \"%s\"",
in.string().c_str(), p.string().c_str(), out.c_str());
fs::path temp = in;
temp.up();
arx_assert_msg(temp.string() == out, "\"%s\".up() ->\"%s\" != \"%s\"",
in.string().c_str(), temp.string().c_str(), out.c_str());
}
SnapShot::SnapShot(const fs::path & name, bool replace) {
int num = 0;
do {
ostringstream oss;
oss << name.filename() << '_' << num << ".bmp";
file = name.parent() / oss.str();
num++;
} while(!replace && fs::exists(file));
}