A Header-Only Library?

[ShihaoWang]

Hi,

A compilation issue came to me when I would like to run the test code. It seems to me that this package is header-only and there is no need to compile sth. However, compilation error is reported during the link stage

CMakeFiles/MyApp.dir/src/main.cc.o: In function `demo_bezier()':
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:17: undefined reference to `Bezier::Bezier()'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:19: undefined reference to `Vector::Vector(double, double, double)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:19: undefined reference to `Curve::add_way_point(Vector const&)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:20: undefined reference to `Vector::Vector(double, double, double)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:20: undefined reference to `Curve::add_way_point(Vector const&)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:21: undefined reference to `Vector::Vector(double, double, double)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:21: undefined reference to `Curve::add_way_point(Vector const&)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:22: undefined reference to `Vector::Vector(double, double, double)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:22: undefined reference to `Curve::add_way_point(Vector const&)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:26: undefined reference to `Vector::toString[abi:cxx11]() const'
CMakeFiles/MyApp.dir/src/main.cc.o: In function `demo_bspline()':
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:32: undefined reference to `BSpline::BSpline()'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:34: undefined reference to `Vector::Vector(double, double, double)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:34: undefined reference to `Curve::add_way_point(Vector const&)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:35: undefined reference to `Vector::Vector(double, double, double)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:35: undefined reference to `Curve::add_way_point(Vector const&)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:36: undefined reference to `Vector::Vector(double, double, double)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:36: undefined reference to `Curve::add_way_point(Vector const&)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:37: undefined reference to `Vector::Vector(double, double, double)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:37: undefined reference to `Curve::add_way_point(Vector const&)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:41: undefined reference to `Vector::toString[abi:cxx11]() const'
CMakeFiles/MyApp.dir/src/main.cc.o: In function `demo_catmullrom()':
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:47: undefined reference to `CatmullRom::CatmullRom()'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:49: undefined reference to `Vector::Vector(double, double, double)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:49: undefined reference to `Curve::add_way_point(Vector const&)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:50: undefined reference to `Vector::Vector(double, double, double)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:50: undefined reference to `Curve::add_way_point(Vector const&)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:51: undefined reference to `Vector::Vector(double, double, double)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:51: undefined reference to `Curve::add_way_point(Vector const&)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:52: undefined reference to `Vector::Vector(double, double, double)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:52: undefined reference to `Curve::add_way_point(Vector const&)'
/home/motion/cpp-spline/spline/src/test/cpp/src/main.cc:56: undefined reference to `Vector::toString[abi:cxx11]() const'
CMakeFiles/MyApp.dir/src/main.cc.o: In function `Curve::node(int) const':
/home/motion/cpp-spline/spline/src/main/cpp/../../main/cpp/Curve.h:28: undefined reference to `Vector::Vector(Vector const&)'
collect2: error: ld returned 1 exit status
CMakeFiles/MyApp.dir/build.make:109: recipe for target 'MyApp' failed
make[2]: *** [MyApp] Error 1
CMakeFiles/Makefile2:72: recipe for target 'CMakeFiles/MyApp.dir/all' failed
make[1]: *** [CMakeFiles/MyApp.dir/all] Error 2
Makefile:83: recipe for target 'all' failed
make: *** [all] Error 2

Can you provide me with an insight about what could be the cause for this problem?