How to Convert C Strings to Enums Efficiently?

Converting C Strings to Enums

In C , developers often encounter the need to translate strings into enums. A naive approach would be to employ a lengthy switch statement. However, more convenient methods exist.

One solution is a mapping using a standard library map, which establishes a correspondence between strings and enums. While this can be effective, it requires meticulous initialization.

With the advent of C 11, a more streamlined approach is available. Using an unordered map, you can construct a table mapping strings to enums during the compilation phase:

static std::unordered_map<std::string,E> const table = { {"a",E::a}, {"b",E::b} };

Retrieving the corresponding enum for a given string is now straightforward:

auto it = table.find(str);
if (it != table.end()) {
  return it->second;
} else {
  // Handle error
}

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