In this paper, we present a crash-resistant C++ library for executing unrestricted transactions, provided as lambdas. Our implementation bridges the gap between existing crash-resistant and unrestricted transaction implementations in C++. We first developed a non-crash-resistant version to enable the execution of lambda transactions. To achieve crash resistance, we utilized a clang plugin during compilation to modify the source file and stored critical runtime variables in a file. While our approach is approximately three times slower than transaction implementations without lambdas, the benefits of full crash resistance make it a compelling trade-off.