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{{cpp/title|underflow_error}}
{{cpp/error/navbar}}
{{ddcl|header=stdexcept|
class underflow_error;
}}

Defines a type of object to be thrown as exception. It may be used to report arithmetic underflow errors (that is, situations where the result of a computation is a subnormal floating-point value).

The standard library components do not throw this exception (mathematical functions report underflow errors as specified in {{lc|math_errhandling}}). Third-party libraries, however, use this. For example, [https://www.boost.org/doc/libs/1_66_0/libs/math/doc/html/math_toolkit/error_handling.html boost.math] throws {{tt|std::underflow_error}} if {{tt|boost::math::policies::throw_on_error}} is enabled (the default setting).

{{cpp/is_constexpr|since=c++26|transient=yes}}

{{inheritance diagram/std-underflow_error}}

===Member functions===
{{cpp/error/exception/member of derived with message|underflow_error}}

{{cpp/error/runtime_error/inherit}}

{{cpp/error/exception/inherit}}

===Notes===
{{ftm begin}}
{{ftm|__cpp_lib_constexpr_exceptions|std=C++26|value=202502L|{{c/core|constexpr}} exception types}}
{{ftm end}}

===Defect reports===
{{dr list begin}}
{{dr list item|wg=lwg|dr=254|std=C++98|before=the constructor accepting {{c|const char*}} was missing|after=added}}
{{dr list item|wg=lwg|dr=471|std=C++98|before=the explanatory strings of {{tt|std::underflow_error}}'s<br>copies were implementation-defined|after=they are the same as that of the<br>original {{tt|std::underflow_error}} object}}
{{dr list end}}

{{langlinks|de|es|fr|it|ja|pt|ru|zh}}

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