../Classes/State.cpp:193:2: error: ‘FileStream’ was not declared in this scope
FileStream f(stdout);
^
../Classes/State.cpp:193:13: error: expected ‘;’ before ‘f’
FileStream f(stdout);
^
../Classes/State.cpp:194:2: error: ‘PrettyWriter’ was not declared in this scope
PrettyWriter<FileStream> writer(f);
^
../Classes/State.cpp:194:34: error: ‘f’ was not declared in this scope
PrettyWriter<FileStream> writer(f);
^
../Classes/State.cpp:194:35: error: ‘writer’ was not declared in this scope
PrettyWriter<FileStream> writer(f);
Seems like a dumb question, but are you sure you’re including the headers containing FileStream and PrettyWriter? Also make sure you’re using the proper namespace.