CS253 HW6: Operators!

Description

You will improve on your work in HW5, adding some operators.                 

Methods

Enemy must have the following additional public methods & operators:

Enemy[key]

key can be either a C-style string or a std::string. Return a copy of the value for that key. If the key is not found, throw a range_error, including the bad key.

Enemy[size_t]

Given a zero-based index, return a by value a std::pair containing, in order, the corresponding key & value. If the index is out of range, throw a range_error, including the erroneous & maximum indices.

A zero argument to [] does not necessarily return the first key/value pair read. The exact order is unspecified, but all pairs must be represented.

if (Enemy)

Succeed if and only if the Enemy is not empty.

if (Enemy1 == Enemy2)

Succeed if and only if the enemies have the same key/value pairs. This must work no matter in what order the key/value pairs were read.

if (Enemy1 != Enemy2)

Same as above, but inequality.

Gallery must have the following additional public methods & operators:

Gallery[size_t]

Given a zero-based index, return a reference to the corresponding Enemy in this Gallery. If the Gallery is const, then return a const reference. If the index is out of range, throw a range_error, including the erroneous & maximum indices.

A zero argument to [] does not necessarily return the first Enemy read. The exact order is unspecified, but all enemies must be represented.

if (Gallery)

Succeed if and only if the Gallery is not empty.

You may define other methods, data, or classes, public or private, as you see fit.                 

    export STACK_FRAME_LINK_OVERRIDE=ffff-ad921d60486366258809553a3db49a4a

Sample Run

This focuses on the features added in this assignment. This does not imply that the previous features are abandoned.                 

% cat CMakeLists.txt
cmake_minimum_required(VERSION 3.14)

# Using -Wall is required:
add_compile_options(-Wall)

# These compile flags are highly recommended, but not required:
add_compile_options(-Wextra -Wpedantic)

# Optional super-strict mode:
add_compile_options(-fmessage-length=80 -fno-diagnostics-show-option)
add_compile_options(-fstack-protector-all -g -O3 -std=c++14 -Walloc-zero)
add_compile_options(-Walloca -Wctor-dtor-privacy -Wduplicated-cond)
add_compile_options(-Wduplicated-branches -Werror -Wfatal-errors -Winit-self)
add_compile_options(-Wlogical-op -Wold-style-cast -Wshadow)
add_compile_options(-Wunused-const-variable=1 -Wzero-as-null-pointer-constant)

# add_compile_options must be BEFORE add_executable or add_library.

add_library(hw6 Enemy.cc Keys.cc Gallery.cc)
add_executable(test test.cc)
target_link_libraries(test hw6)

# Create a tar file every time:
add_custom_target(hw6.tar ALL COMMAND tar cf hw6.tar *.cc *.h CMakeLists.txt)
% cat pokékeys
Weight
Height
Name
LinkEvolvesFrom
LinkEvolvesTo
URL
% cat pokémon

Name Bulbasaur
Weight 15.2#
LinkEvolvesTo Ivysaur
URL https://www.pokemon.com/us/pokedex/bulbasaur?4915199

Name Ivysaur
Weight 28.7#
LinkEvolvesTo Venusaur
LinkEvolvesFrom Bulbasaur
URL https://www.pokemon.com/us/pokedex/ivysaur?4915199

Name Venusaur
Weight 220.5#
LinkEvolvesFrom Ivysaur
URL https://www.pokemon.com/us/pokedex/venusaur?4915199

% cat test.cc
#include "Gallery.h"
#include <cassert>
#include <iostream>
#include <string>

using namespace std;

void show(const Enemy &e) {
    for (size_t i=0; i<e.size(); i++) {
        pair<string,string> p = e[i];
        assert(e[p.first] == p.second);
        cout << p.first << ": " << p.second << '\n';
    }
}

void show(const Gallery &g) {
    for (size_t i=0; i<g.size(); i++) {
        if (i>0)
            cout << '\n';
        show(g[i]);
    }
}

int main() {
    Gallery vacant("pokékeys", "/dev/null");
    const Gallery monsters("pokémon", "pokékeys");

    assert(!vacant);
    assert(monsters);
    assert(monsters[0]);

    assert(monsters[0] == monsters[0]);
    assert(monsters[1] == monsters[1]);
    assert(!(monsters[1] == monsters[0]));
    assert(!(monsters[0] == monsters[1]));

    assert(!(monsters[0] != monsters[0]));
    assert(!(monsters[1] != monsters[1]));
    assert(monsters[1] != monsters[0]);
    assert(monsters[0] != monsters[1]);

    show(vacant);
    show(monsters);

    return 0;
}
% cmake .
… cmake output appears here …
% make
… make output appears here …
% ./test
LinkEvolvesTo: Ivysaur
Name: Bulbasaur
URL: https://www.pokemon.com/us/pokedex/bulbasaur?4915199
Weight: 15.2#

LinkEvolvesFrom: Bulbasaur
LinkEvolvesTo: Venusaur
Name: Ivysaur
URL: https://www.pokemon.com/us/pokedex/ivysaur?4915199
Weight: 28.7#

LinkEvolvesFrom: Ivysaur
Name: Venusaur
URL: https://www.pokemon.com/us/pokedex/venusaur?4915199
Weight: 220.5#

Hints

Curious how to do the if (Enemy) thing? Read about Conversion Methods at the end of the Struct and Class lecture.                 

Requirements

Same as the previous assignment, given the additional features above.                 

Tar file

• The tar file for this assignment must be called: hw6.tar
• It must contain:
  • source files (*.cc), including Enemy.cc and Gallery.cc
  • header files (*.h), including Enemy.h and Gallery.h
  • CMakeLists.txt, which will create the library file libhw6.a.
• These commands must produce the library libhw6.a:

    cmake . && make

• Your CMakeLists.txt must use at least -Wall when compiling.

How to submit your homework:

• Use web checkin, or Linux checkin:

    ~cs253/bin/checkin HW6 hw6.tar

How to receive negative points:

Turn in someone else’s work.