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# Distributed under the OSI-approved BSD 3-Clause License. See accompanying
# file LICENSE.rst or https://cmake.org/licensing for details.
#[=======================================================================[.rst:
TestForSSTREAM
--------------
This module checks whether the C++ standard header ``<sstream>`` exists and
functions correctly.
Load this module in a CMake project with:
.. code-block:: cmake
include(TestForSSTREAM)
In early versions of C++ (pre-C++98), the ``<sstream>`` header was not
formally standardized and may not have been available.
This module defines the following cache variables:
``CMAKE_NO_ANSI_STRING_STREAM``
A cache variable indicating whether the ``<sstream>`` header is available. It
will be set to value ``0`` if ``<sstream>`` is available (``C++ 98`` and
newer), and to value ``1`` if ``<sstream>`` is missing (``ANSI C++``).
``CMAKE_HAS_ANSI_STRING_STREAM``
A cache variable that is the opposite of ``CMAKE_NO_ANSI_STRING_STREAM``
(true if ``<sstream>`` is available and false if ``<sstream>`` is missing).
.. note::
The ``<sstream>`` header was formally introduced in the ``C++ 98`` standard,
making this check obsolete for modern compilers.
Examples
^^^^^^^^
Including this module will check for ``<sstream>`` support and define the
``CMAKE_NO_ANSI_STRING_STREAM`` cache variable:
.. code-block:: cmake
:caption: ``CMakeLists.txt``
include(TestForSSTREAM)
file(
CONFIGURE
OUTPUT config.h
CONTENT "#cmakedefine CMAKE_NO_ANSI_STRING_STREAM"
)
Then it can be used in a C++ program:
.. code-block:: c++
:caption: ``example.cxx``
#include "config.h"
#ifndef CMAKE_NO_ANSI_STRING_STREAM
# include <sstream>
#endif
int main() { ... }
See Also
^^^^^^^^
* The :module:`CMakeBackwardCompatibilityCXX` module.
#]=======================================================================]
if(NOT DEFINED CMAKE_HAS_ANSI_STRING_STREAM)
message(CHECK_START "Check for sstream")
try_compile(CMAKE_HAS_ANSI_STRING_STREAM
SOURCES ${CMAKE_ROOT}/Modules/TestForSSTREAM.cxx
)
if (CMAKE_HAS_ANSI_STRING_STREAM)
message(CHECK_PASS "found")
set (CMAKE_NO_ANSI_STRING_STREAM 0 CACHE INTERNAL
"Does the compiler support sstream")
else ()
message(CHECK_FAIL "not found")
set (CMAKE_NO_ANSI_STRING_STREAM 1 CACHE INTERNAL
"Does the compiler support sstream")
endif ()
endif()
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