MSVC build errors > C4430

C4430: missing type specifier

error C4430: missing type specifier - int assumed. Note: C++ does not support default-int

The compiler expected a type and did not find one. Most often, a type name is unknown at that point, and C2143 or C2061 errors come with it.

Causes and fixes

1. The type is not declared yet. Include the header that declares it, before the line that uses it.
2. Two headers include each other. With a circular include, one class is not declared when the other uses it. Replace the include with a forward declaration (class Widget;) where a pointer or a reference is enough.
3. A function has no return type. Write it, for example void or int: C++ has no default int.
4. The type is in a namespace. Qualify it, for example std::string.

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Related errors: C2065, C2011. See all guides.