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## Macro BOOST_VMD_ASSERT_IS_NUMBER

BOOST_VMD_ASSERT_IS_NUMBER — Asserts that the sequence is a number.

## Synopsis

    // In header: <boost/vmd/assert_is_number.hpp>

    BOOST_VMD_ASSERT_IS_NUMBER(sequence)

## Description

The macro checks that the parameter is a number. If it is not a number, it forces a compiler error.

The macro normally checks for a number only in debug mode. However an end-user can force the macro to check or not check by defining the macro BOOST_VMD_ASSERT_DATA to 1 or 0 respectively.

sequence = a possible number.

returns = Normally the macro returns nothing.

If the sequence is a number, nothing is output.

For VC++, because there is no sure way of forcing a compiler error from within a macro without producing output, if the sequence is not a number the macro forces a compiler error by outputting invalid C++.

For all other compilers a compiler error is forced without producing output if the sequence is not a number.