here is the basic header file basicgl.hpp
#include
#include
#include
#include
#include
#include
#include
#include
template <class T>
boost::function getVerxFunc2()
{
BOOST_STATIC_ASSERT(boost::is_integral<T>::value ||
boost::is_floating_point<T>::value);
return (boost::is_floating_point<T>::value) ? &glVertex2d : &glVertex2i;
}
template <class T>
boost::function getVerxFunc3()
{
BOOST_STATIC_ASSERT(boost::is_integral<T>::value ||
boost::is_floating_point<T>::value);
return (boost::is_integral<T>::value) ? &glVertex3i : &glVertex3d;
}
template <class T>
void drawDot(const T& x, const T& y) {
boost::function myFunc(getVerxFunc2<T>());
glBegin(GL_POINTS);
myFunc(x, y);
glEnd();
glFlush();
}
template <class T>
void drawDot(const T& x, const T& y, const T& z) {
boost::function
myFunc(getVerxFunc3<T>());
glBegin(GL_POINTS);
myFunc(x, y, z);
glEnd();
glFlush();
}
template <class T>
void drawLine(const T& x1, const T& y1, const T& x2, const T& y2) {
boost::function myFunc(getVerxFunc2<T>());
glBegin(GL_LINE);
myFunc(x1, y1);
myFunc(x2, y2);
glEnd();
glFlush();
}
template <class T>
void drawLine(const T& x1, const T& y1, const T& x2, const T& y2, const T&
z1, const T& z2) {
boost::function
myFunc(getVerxFunc3<T>());
glBegin(GL_LINE);
myFunc(x1, y1, z1);
myFunc(x2, y2, z2);
glEnd();
glFlush();
}
drawLine(4.1, 5.2, 3.9, 4.2);
When i compile i get the following errors.
16 D:\Data\cs classes\cs450\c++\BasicGL.hpp conditional expression between
distinct pointer types `void (*)(GLdouble, GLdouble)' and `void (*)(GLint,
GLint)' lacks a cast
46 D:\Data\cs classes\cs450\c++\BasicGL.hpp instantiated from `void
drawLine(const T&, const T&, const T&, const T&) [with T = GLdouble]'
16 D:\Data\cs classes\cs450\c++\BasicGL.hpp invalid conversion from `void
(*)(GLdouble, GLdouble)' to `void*'
16 D:\Data\cs classes\cs450\c++\BasicGL.hpp invalid conversion from `void
(*)(GLint, GLint)' to `void*'
85 D:\Data\Devcpp\include\boost_1_33_1\boost\function\function_template.hpp
ISO C++ forbids casting between pointer-to-function and pointer-to-object
Is there a nice work around this?
Thanks.
