[length.error]

# 19 Diagnostics library [[diagnostics]](./#diagnostics)

## 19.2 Exception classes [[std.exceptions]](std.exceptions#length.error)

### 19.2.6 Class length_error [length.error]

[🔗](#lib:length_error)

namespace std {class length_error : public logic_error {public:constexpr explicit length_error(const string& what_arg); constexpr explicit length_error(const char* what_arg); };}

[1](#1)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/diagnostics.tex#L215)

The classlength_error defines the type of objects thrown as exceptions
to report an attempt to produce
an object whose length exceeds its maximum allowable size[.](#1.sentence-1)

[🔗](#lib:length_error,constructor)

`constexpr length_error(const string& what_arg);
`

[2](#2)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/diagnostics.tex#L228)

*Postconditions*: strcmp(what(), what_arg.c_str()) == 0[.](#2.sentence-1)

[🔗](#lib:length_error,constructor_)

`constexpr length_error(const char* what_arg);
`

[3](#3)

[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/diagnostics.tex#L239)

*Postconditions*: strcmp(what(), what_arg) == 0[.](#3.sentence-1)