Function value_of

src/env.cpp:53–60

bool disabled(const char* name) { return not enabled(name); }

std::size_t value_of(const char* name, std::size_t fallback)
{
    auto e = env(name);
    if(e.empty())
        return fallback;
    access_envs()([&](auto& m) { m[name] = e.front(); });
    return std::stoul(e.front());
}

std::string string_value_of(const char* name, std::string fallback)
{