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## Function template width

boost::histogram::axis::traits::width — Returns bin width at axis index.

## Synopsis

    // In header: <boost/histogram/axis/traits.hpp>

    template<typename Axis>
      decltype(auto) width(const Axis & axis, index_type index);

## Description

If the axis has no `value` method, throw std::runtime_error. If the method exists and accepts a floating point index, return the result of`axis.value(index + 1) - axis.value(index)`. If the method exists but accepts only integer indices, return 0.

Parameters: |
`axis` | any axis instance
`index` | bin index