Modern C++ Course [Lecture 2] {Compilation, Debugging, Functions, Header/Source, Libraries, CMake}

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http://www.ipb.uni-bonn.de/wp-content/uploads/2018/05/lecture_2.pdf

 make bash file executable

 Wall: Warning all

Wextra: add even more extra Warning

Werror: treat Warnings as errors

by default, there‘s no optimization.

-O0

-O3 -Ofaster 

"segmentation fault" means you are using some unallowed memory.

use reference to avoid copy, and save a lot time!

 explaining how reference as function variable works.

Announce default variables only in declaration (typo above...).

sort, sumation, multiplication standard operation in std::vector

 every header file should include "#pragma once", otherwise you would get wierd errors.

the compiler doesn‘t know the definition of the test.cpp.

simply add the 2nd line will make the "c++ main.cpp ... " work, but no output!

build the test.cpp first, and include the result .o file into main.cpp building.

     c++ workflow!!!

.o file is binary and only machine can read it.

  maybe there‘s a branch of changing now in makefile. but this file is simple and readable.

Modern C++ Course [Lecture 2] {Compilation, Debugging, Functions, Header/Source, Libraries, CMake}

标签：9.png   upload   time   standard   eve   ref   simple   out   std   

原文地址：https://www.cnblogs.com/ecoflex/p/10182982.html