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This appendix contains files from
Volume 1 that are required to build the files in Volume 2.
//: :require.h
// Test for error conditions in programs
// Local "using namespace std" for old compilers
#ifndef REQUIRE_H
#define REQUIRE_H
#include <cstdio>
#include <cstdlib>
#include <fstream>
inline void require(bool requirement,
const char* msg = "Requirement failed") {
using namespace std;
if (!requirement) {
fputs(msg, stderr);
fputs("\n", stderr);
exit(1);
}
}
inline void requireArgs(int argc, int args,
const char* msg = "Must use %d arguments") {
using namespace std;
if (argc != args + 1) {
fprintf(stderr, msg, args);
fputs("\n", stderr);
exit(1);
}
}
inline void requireMinArgs(int argc, int minArgs,
const char* msg =
"Must use at least %d arguments") {
using namespace std;
if(argc < minArgs + 1) {
fprintf(stderr, msg, minArgs);
fputs("\n", stderr);
exit(1);
}
}
inline void assure(std::ifstream& in,
const char* filename = "") {
using namespace std;
if(!in) {
fprintf(stderr,
"Could not open file %s\n", filename);
exit(1);
}
}
inline void assure(std::ofstream& in,
const char* filename = "") {
using namespace std;
if(!in) {
fprintf(stderr,
"Could not open file %s\n", filename);
exit(1);
}
}
#endif // REQUIRE_H ///:~From Volume 1, Chapter
9:
//: C0B:Stack4.h
// With inlines
#ifndef STACK4_H
#define STACK4_H
#include "../require.h"
class Stack {
struct Link {
void* data;
Link* next;
Link(void* dat, Link* nxt):
data(dat), next(nxt) {}
}* head;
public:
Stack(){ head = 0; }
~Stack(){
require(head == 0, "Stack not empty");
}
void push(void* dat) {
head = new Link(dat, head);
}
void* peek() { return head->data; }
void* pop(){
if(head == 0) return 0;
void* result = head->data;
Link* oldHead = head;
head = head->next;
delete oldHead;
return result;
}
};
#endif // STACK4_H ///:~//: C0B:Dummy.cpp
// To give the makefile at least one target
// for this directory
int main() {} ///:~