class

std::length_error

class length_error;

Length error exception

exception
logic_error
length_error

This class defines the type of objects thrown as exceptions to report a length error.

It is a standard exception that can be thrown by programs. Some components of the standard library, such as vector and string also throw exceptions of this type to signal errors resizing.

It is defined as:

class length_error : public logic_error {
public:
  explicit length_error (const string& what_arg);
};

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

Members

constructor: The string passed as what_arg has the same content as the value returned by member what.

The class inherits the what member function from logic_error.

Example

// length_error example
#include <iostream>       // std::cerr
#include <stdexcept>      // std::length_error
#include <vector>         // std::vector

int main (void) {
  try {
    // vector throws a length_error if resized above max_size
    std::vector<int> myvector;
    myvector.resize(myvector.max_size()+1);
  }
  catch (const std::length_error& le) {
	  std::cerr << "Length error: " << le.what() << '\n';
  }
  return 0;
}

Possible output:


Length error: vector::_M_fill_insert

Exception safety

Strong guarantee: if the constructor throws an exception, there are no side effects.

std::length_error

Members

Example

Exception safety

See also

C++

Reference

C library:

Containers:

Input/Output:

Multi-threading:

Other:

<stdexcept>