This gist shows that adding std::numeric_limits<TYPE>::min() to float or double doesn't change the original value, even for as small numbers as 1e-30. This can come useful for calculating logarithms, when one doesn't want `-inf` in the results.

test_floating_point_accuracy.cpp

#include <iostream>
#include <limits>
#include <cassert>
#include <cmath>

int main()
{
    float f = 1e-30;
    float f_plus_min = f + std::numeric_limits<float>::min();
    
    double d = 1e-30;
    double d_plus_min = d + std::numeric_limits<double>::min();
    
    assert(f == f_plus_min);
    assert(logf(f) > -std::numeric_limits<float>::infinity());
    assert(d == d_plus_min);
    assert(log(d) > -std::numeric_limits<double>::infinity());

    return 0;
}