Method retrieve

src/storage/teststorageprovider.cpp:49–54

 }

void TestStorageProvider::retrieve(const char *key, size_t cchKey, callbackSingle fn) const
{
    auto itr = m_map.find(std::string(key, cchKey));
    if (itr != m_map.end())
        fn(key, cchKey, itr->second.data(), itr->second.size());
}

size_t TestStorageProvider::clear()
{