Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. — Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

This is the documentation for a snapshot of the master branch, built from commit 579430ad1f.

Return a double pointer if this is a double, else return nullptr

double const*
if_double() const;
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double*
if_double();
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