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[C++] Add map item passed in by reference

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Why doesn't the following work? Searched everywhere. I want to pass the map in by reference so it doesn't copy it over. Why can't I add an item to the map?

bool Texture2D::ParseTextureAtlas(const string& fileName, const map<string, ImageDef>& imageMap)
imageMap["whatever"] = ImageDef(...);

return true;

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