11.2. Shared objects with templates
Templates are usually declared in a header file. Each time a template is used, code is generated to instantiate the template with the desired parameters. Most C++ compilers work with a template repository. No template code is generated at compile time; the compiler just remembers where the template code came from. Then, at link time, as the compiler/linker puts all parts together, it notices which templates actually need to be generated. The code is then produced, compiled, and linked into the application.
This becomes a problem when using templates with shared libraries, where no actual linking takes place. Therefore, you must make sure that the template code is generated when producing the shared library. ...
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