UnUsual Error Setting up TMap ("Expected an Expression")

[Fahad_naseem]

Well I was suprised to see something like this :
(Error “Expected an expression”).
I had included the map header file as well as defined TMap in “.cpp” file.
If i use std::map in IsIsogram() instead of defining #define TMap = std::map for it IT WORKS! without any error
Anyone give me a clue/suggestion for resolving this error

[DanM]

#define is a textual replacement, it has no knowledge of C++ syntax or anything else for that matter.
It’s super dumb and will blindly replace the token with the replacement text. i.e. for what you have written it will replace TMap with = std::map

So when you write

TMap<char, bool> letterSeen;

It’s going to replace that so you have

= std::map<char, bool> letterSeen;

[Fahad_naseem]

@DanM Thanks a lot I’ve got my misconceptions cleared between using abc = data_type and #define , Thanks