Code Model

The code model offers services such as code completion, syntactic and semantic highlighting, and diagnostics.

To configure the C++ code model globally, go to Preferences > C++ > Code Model.

{C++ Code Model preferences}

The following table summarizes the preferences.

Interpret ambiguous headers as C headersInstructs the code model to interpret ambiguous header files as C language files. Select this checkbox if you develop mainly using C.
Ignore precompiled headersClear this checkbox to process precompiled headers.
Use built-in preprocessor to show pre-processed filesUses the built-in preprocessor to show the pre-processed source file in the editor.
Enable indexingTurns on the built-in indexer. Clearing this checkbox severely limits the capabilities of the code model.
Do not index files greater thanTo avoid out-of-memory crashes caused by indexing huge source files that are typically auto-generated by scripts or code, the size of files to index is limited to 5MB by default.

To index all files, clear the checkbox.

Ignore filesTo ignore files that match wildcard patterns, enter each wildcard pattern on a separate line in the field.

Inspect preprocessed C++ code

To analyze the causes of compile errors or errors caused by wrong includes pulled in by dependencies or C++ macros expanding to something unexpected, select Show Preprocessed Source in the editor context menu.

This action expands all C++ macros to their actual code and removes code that is guarded by a currently inactive #ifdef statements.

If you clear Use built-in preprocessor to show pre-processed files, this action also expands all "#include <foo.h>" statements to their actual contents.

See also Configure C++ code model, Specify clangd settings, Clang Code Model, and Clangd.

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