小编Nat*_*ton的帖子

我试图从Stroustrup的原理和实践... C++中获取图形示例,但无济于事.我已经安装了fltk的东西,并知道它工作正常,因为我设法得到一个窗口显示使用他的书的附录中建议的程序:

#include <FL/Fl.H>
#include <FL/Fl_Box.H>
#include <FL/Fl_Window.H>

int main(){

    Fl_Window window(200,200, "title here");
    Fl_Box box(0,0,200,200,"Hey, hello wrld");
    window.show();
    return Fl::run();
}

然而,尝试使用他的Simple_window.h(可以在他的网站上找到)给出"对'Window'的引用是模棱两可的",因为它已经在usr/include/X11/Xh.所以我尝试将命名空间指定为相关的命名空间:

struct Simple_window : Graph_lib::Window {  //Changed Window to inc. namespace
    Simple_window(Point xy, int w, int h, const string& title );

    bool wait_for_button(); // simple event loop

.
.
.

但这给了我一堆我不理解的错误:

$ clear; g++ -Wno-deprecated window.cpp -o holz
    /tmp/ccIFivNg.o: In function `main':
    window.cpp:(.text+0x64): undefined reference to `Simple_window::Simple_window(Point, int, int, String const&)'
    /tmp/ccIFivNg.o: In function `Graph_lib::Window::~Window()':
    window.cpp:(.text._ZN9Graph_lib6WindowD2Ev[_ZN9Graph_lib6WindowD5Ev]+0x14): undefined reference …

我正在尝试编译具有不同优化级别的不同软件目录等.我创建了以下makefile来执行此操作:

OWNER           = betsy molly fred
DOG             = poodle mutt doberman
COLOUR          = brown red yellow
ATTR            = big small
LEGS            = 0 3

#we want every possible combination to be excercised
OUTPUT_STUFF = $(foreach own,$(OWNER),$(foreach dog,$(DOG),$(foreach col,$(COLOUR),$(foreach attr,$(ATTR),$(foreach legs,$(LEGS),new/$(own)/$(dog)/$(col)/$(attr)/$(legs)/dogInfo.txt)))))

.PHONY: all

all: $(OUTPUT_STUFF)

define PROGRAM_template

own             = $(1)
dog             = $(2)
col             = $(3)
attr            = $(4)
legs            = $(5)

BUILD_DIR           = new/$(own)/$(dog)/$(col)/$(attr)/$(legs)

#for each build directory, we are going to put a file in it containing the build …