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--guiding_decls, --no_guiding_decls

This option enables or disables the recognition of guiding declarations for template functions in C++.

A guiding declaration is a function declaration that matches an instance of a function template but has no explicit definition because its definition derives from the function template.

If --no_guiding_decls is combined with --old_specializations, a specialization of a nonmember template function is not recognized. It is treated as a definition of an independent function.

Note

The option --guiding_decls is provided only as a migration aid for legacy source code that does not conform to the C++ standard. Its use is not recommended.

Mode

This option is effective only if the source language is C++.

Default

The default is --no_guiding_decls.

Example

template <class T> void f(T)
{
    ...
}
void f(int);

When regarded as a guiding declaration, f(int) is an instance of the template. Otherwise, it is an independent function so you must supply a definition.