c++ example

Signed-off-by: Leonardo de Moura <leonardo@microsoft.com>

examples/c++/README

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+Small example using the c++ bindings.
+To build the example execute
+   make examples
+in the build directory.
+
+This command will create the executable cpp_example.
+On Windows, you can just execute it.
+On OSX and Linux, you must install z3 first using 
+   sudo make install
+OR update LD_LIBRARY_PATH (Linux) or DYLD_LIBRARY_PATH (OSX) with the build directory. You need that to be able to find the Z3 shared library.

examples/c++/README.txt

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-This directory contains scripts to build the test application using
-Microsoft C compiler, or g++.
-
-1) Using Microsoft C compiler
-
-Use 'build.cmd' to build the test application using Microsoft C
-compiler.
-
-Remark: The Microsoft C compiler (cl) must be in your path,
-or you can use the Visual Studio Command Prompt.
-
-The script 'exec.cmd' adds the bin directory to the path. So, 
-example.exe can find z3.dll.
-
-2) Using gcc
-
-You must install Z3 before running this example.
-To install Z3, execute the following command in the Z3 root directory.
-
-  sudo make install
-
-Use 'build.sh' to build the test application using g++. 
-It generates the executable 'example'.
-

examples/c++/build-external.cmd

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-cl /EHsc /I ..\..\include /I . ..\..\bin\z3.lib example.cpp

examples/c++/build.cmd

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-cl /W3 /EHsc /I ..\lib ..\debug\z3_dbg.lib example.cpp

examples/c++/build.sh

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-if g++ -fopenmp -o example example.cpp -lz3; then
-    echo "Example was successfully compiled."
-    echo "To run example, execute:"
-    echo "  ./example"
-else
-    echo "You must install Z3 before compiling this example."
-    echo "To install Z3, execute the following command in the Z3 root directory."
-    echo "   sudo make install"
-fi

examples/c++/exec-external.cmd

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-@echo off
-SETLOCAL
-set PATH=..\..\bin;%PATH%
-example.exe
-ENDLOCAL