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POcmath functions generating compiler error
 

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  1. POcmath functions generating compiler error
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    <p>I've written a small program that utilizes the Fast Light Toolkit and for some reason a compiler error is generated when trying to access the functions in the cmath header.</p> <p>Such as error ::acos has not been declared.</p> <p>This goes on for pretty much every function it tries to use in the header. What could I be missing?</p> <p>The header files I have included are</p> <pre><code>Simple_window.h Graph.h </code></pre> <p>both of which are part of the FLTK.</p> <p>The code is this:</p> <pre><code> #include "Simple_window.h" // get access to our windows library #include "Graph.h" // get access to graphics library facilities int main() { using namespace Graph_lib; // our graphics facilities are in Graph_lib Point tl(100,100); // to become top left corner of window Simple_window win(tl,600,400,"Canvas"); // make a simple window Polygon poly; // make a shape (a polygon) poly.add(Point(300,200)); // add a point poly.add(Point(350,100)); // add another point poly.add(Point(400,200)); // add a third point poly.set_color(Color::red); // adjust properties of poly win.attach(poly); // connect poly to the window win.wait_for_button(); // give control to display engine } </code></pre> <p>Edit: Here is example code of when the compiler error is generated. This is inside the cmath header.</p> <pre><code>namespace std { // Forward declaration of a helper function. This really should be // an `exported' forward declaration. template&lt;typename _Tp&gt; _Tp __cmath_power(_Tp, unsigned int); inline double abs(double __x) { return __builtin_fabs(__x); } inline float abs(float __x) { return __builtin_fabsf(__x); } inline long double abs(long double __x) { return __builtin_fabsl(__x); } using ::acos; //ERROR HERE inline float acos(float __x) { return __builtin_acosf(__x); } inline long double acos(long double __x) { return __builtin_acosl(__x); } template&lt;typename _Tp&gt; inline typename __enable_if&lt;double, __is_integer&lt;_Tp&gt;::_M_type&gt;::_M_type acos(_Tp __x) { return __builtin_acos(__x); } </code></pre> <p>Edit: Code::blocks is saving files as C files....</p>
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    1. COOn a side note, try to focus on "why", not "what", in comments. poly.add(Point(300,200)); // add a point We know it's adding a point. Say "why" you add that point. Also, it's not a good idea to align the comments.
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      1. USDavid Lin
    2. COThis was directly from the book I'm using. It's more to help myself understand what the different functions do.
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    3. COWhat compiler/version are you using? Is that the first error you get? (my wild guess now is that the compiler is not correctly installed as the error is within the library: is the compiler locating the <math.h> library?)
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      1. USDavid Rodríguez - dribeas
 

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