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

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value::to_number

Return the stored number cast to an arithmetic type.

template<
    class T>
T
to_number(
    error_code& ec) const;
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template<
    class T>
T
to_number(
    std::error_code& ec) const;
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template<
    class T>
T
to_number() const;
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