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Utility Cookbook utility scripts for quick reference

Makefile

BINS = $(patsubst %.cc, %.out, $(wildcard *.cc))
OBJS = $(patsubst %.cc, %.o, $(wildcard *.cc))
TARGET = $(BINS) $(OBJS)

CFLAGS = -std=c++11

.PHONY: debug all clean


all : $(TARGET)

debug: CFLAGS += -g
debug: $(TARGET)

.cc.o :
    clang++ -c $< -o $@ $(CFLAGS)

%.out : $(OBJS)
    clang++ -o $@ $^ $(CFLAGS)

clean:
    rm -rf $(TARGET)

Note the preceding spaces is not spaces but a single tab.

Debug build

make debug

Release build

make

Reference

Brew

How to remove outdated installed versions of homebrew backages

brew cleanup

Python timeit script to compare performance of two executables

import timeit, subprocess, sys, random;

def call_generate_case():
    for _ in range(10):
        print(random.randint(1, 9));

def run_shell_cmd(cmd):
    subprocess.call(cmd.split());

sys.stdout = open('LOG', 'w');
call_generate_case();
sys.stdout = sys.__stdout__;

def run_executable(exe_name, infile_name, outfile_name):
    with open(infile_name, 'r') as infile:
        with open(outfile_name, 'w') as outfile:
            subprocess.call(exe_name, stdin=infile, stdout=outfile);

print("[Run 1]: ", timeit.timeit('run_executable("./solve1.out", "LOG", "LOG1")', number=1, setup="from __main__ import run_executable"));
print("[Run 2]: ", timeit.timeit('run_executable("./solve2.out", "LOG", "LOG2")', number=1, setup="from __main__ import run_executable"));
run_shell_cmd("vimdiff LOG1 LOG2");

Equivalent to the following bash commands but with timeit report.

python -c 'import test_time; test_time.call_generate_case()'     # If the script name is test_time.py which directs its output to LOG
./solve1.out < LOG > LOG1
./solve2.out < LOG > LOG2
vimdiff LOG1 LOG2

Reference