docs/clang-tidy/checks/bugprone-string-constructor.rst

.. title:: clang-tidy - bugprone-string-constructor

bugprone-string-constructor
===========================

Finds string constructors that are suspicious and probably errors.

A common mistake is to swap parameters to the 'fill' string-constructor.

Examples:

.. code-block:: c++

  std::string str('x', 50); // should be str(50, 'x')

Calling the string-literal constructor with a length bigger than the literal is
suspicious and adds extra random characters to the string.

Examples:

.. code-block:: c++

  std::string("test", 200);   // Will include random characters after "test".

Creating an empty string from constructors with parameters is considered
suspicious. The programmer should use the empty constructor instead.

Examples:

.. code-block:: c++

  std::string("test", 0);   // Creation of an empty string.

Options
-------

.. option::  WarnOnLargeLength

   When non-zero, the check will warn on a string with a length greater than
   `LargeLengthThreshold`. Default is `1`.

.. option::  LargeLengthThreshold

   An integer specifying the large length threshold. Default is `0x800000`.