Sophus库（Linux下）的安装（模板类.hpp，非模板类.h）

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sudo git clone https://github.com/strasdat/Sophus.git
cd Sophus
sudo mkdir build && cd build
sudo cmake .. && sudo make install

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git clone https://github.com/strasdat/Sophus.git Sophus_no_template
cd Sophus_no_template
git checkout a621ff 
sudo mkdir build && cd build
sudo cmake -D CMAKE_INSTALL_PREFIX=/usr/local/include/sophus_no_template ..
sudo make install 

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/slam_packages/sophus_no_template/sophus/so2.cpp:32:26: error: lvalue required as left operand of assignment
   unit_complex_.real() = 1.;
                          ^~
/slam_packages/sophus_no_template/sophus/so2.cpp:33:26: error: lvalue required as left operand of assignment
   unit_complex_.imag() = 0.;

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unit_complex_.real() = 1.;
unit_complex_.imag() = 0.;

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unit_complex_.real(1.);
unit_complex_.imag(0.);