mirror of
https://github.com/triqs/dft_tools
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107 lines
3.0 KiB
ReStructuredText
107 lines
3.0 KiB
ReStructuredText
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TRIQS as a library
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==================
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.. highlight:: c
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Let's say you want to write a new code that uses the libraries and headers of
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TRIQS but that is not meant to be a part of TRIQS. Here's how you should
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proceed in order to do that.
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Setting the stage
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-----------------
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Just to be clear, let me start by showing the directory structure
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I will use:
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.. code-block :: bash
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/home/triqs/install --> TRIQS is installed here
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/home/project/src --> the sources of my project
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/home/project/build --> the directory where I will compile my code
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Basically, this structure means that you have successfully installed TRIQS in
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:file:`/home/triqs/install` and that you plan to have your new project under
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:file:`/home/project`. Obviously you can choose any other directory but this
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structure will be assumed below.
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Start your project
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------------------
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As we just said, we will start our project in a directory
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:file:`/home/project`. We will have the sources in :file:`/home/project/src`
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and later build (compile) the project in :file:`/home/project/build`. Let's
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start by writing some sources:
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.. code-block :: bash
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$ cd /home
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$ mkdir project
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$ cd project
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$ mkdir src
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$ cd src
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OK, our project will be just one :file:`main.cpp` file, e.g.::
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#include <triqs/arrays/array.hpp>
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namespace tqa = triqs::arrays;
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int main(){
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tqa::array<double,1> A(10), B(10);
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A()=2; B()=3;
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tqa::array<double,1> C = A+B;
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std::cout << "C = "<< C << std::endl;
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}
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As you can see, the code includes headers from TRIQS. Along with
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:file:`main.cpp` we write a :file:`CMakeLists.txt` file to compile our project.
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In order to make this easy, there is a file called :file:`TRIQSConfig.cmake`
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in :file:`/home/triqs/install/share/triqs/cmake`. Including this file in
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your :file:`CMakeLists.txt` automatically defines a certain number of useful
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variables, especially the include directories related to the TRIQS headers and
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the location of the TRIQS libraries. Here is what your simple
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:file:`CMakeLists.txt` can be:
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.. code-block :: bash
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cmake_minimum_required(VERSION 2.8)
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project(myproj CXX)
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set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++0x")
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set(CMAKE_BUILD_TYPE Release)
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SET(CMAKE_INSTALL_RPATH "${TRIQS_PATH}/lib")
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SET(CMAKE_INSTALL_RPATH_USE_LINK_PATH TRUE)
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SET(CMAKE_BUILD_WITH_INSTALL_RPATH TRUE)
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include(${TRIQS_PATH}/share/triqs/cmake/TRIQSConfig.cmake)
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add_executable(example main.cpp)
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include_directories(${TRIQS_INCLUDE} ${EXTRA_INCLUDE} ${CBLAS_INCLUDE} ${FFTW_INCLUDE})
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target_link_libraries(example ${TRIQS_LIBRARY} ${EXTRA_LIBRARY})
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We're all set! Everything is ready to compile our project. If we want to build
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everything in :file:`/home/project/build`, we do as follows:
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.. code-block :: bash
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$ cd /home/project
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$ mkdir build
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$ cd build
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$ cmake -DTRIQS_PATH=/home/triqs/install /home/project/src
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$ make
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$ ./example
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That's it! You can modify your sources and then recompile with make. Obviously
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with bigger projects your :file:`CMakeLists.txt` file will change, but the
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principle remains the same.
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