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 69109f5924.

Return an int64_t pointer if this is a signed integer, else return nullptr

std::int64_t const*
if_int64() const;

If this->kind() == kind::int64, returns a pointer to the underlying integer. Otherwise, returns nullptr.

The return value is used in both a boolean context and to assign a variable:

if ( auto p = jv.if_int64() )
    return *p;

Constant.

No-throw guarantee.