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Boost是一个功能强大、构造精巧、跨平台、开源并且完全免费的C++程序库，有着“C++‘准’标准库”的美誉，值得每位C++程序员学习使用。
1 安装Boost
1.1 使用源码安装
下载Boost源码
解压放在任意目录，例如/usr/local/boost_1_63_0
./bootstrap.sh
./b2 headers
./b2
留意运行日志头文件目录 /usr/local/boost_1_63_0, lib目录/usr/local/boost_1_63_0/stage/lib
打开源码中index.html查看使用文档
1.2 使用Homebrew安装
下载安装HomeBrew
brew install boost
留意运行日志会显示头文件目录 /usr/local/Cellar/boost/1.60.0_2/include, lib目录/usr/local/Cellar/boost/1.60.0_2/lib
1.3 使用MacPort安装
下载安装MacPort
sudo port install boost
2 在XCode项目中使用Boost
新建一个Command Line Tool项目
在Build Setings - Header Search Paths 增加头文件目录
替换main.cpp中代码，运行！输入任意数字回车可看到结果。
#include <iostream> #include <boost/lambda/lambda.hpp> int main(int argc, const char * argv[]) { printf("Please input any number:"); using namespace boost::lambda; typedef std::istream_iterator<int> in; std::for_each(in(std::cin), in(), std::cout << (_1 * 3) << " " ); return 0; } 3 在XCode项目中使用Boost Lib库
Boost的很多功能都是直接在hpp头文件里实现的，比如上面的lambda例子不用导入任何lib就可以运行了。但也有一部分需要依赖指定lib库才能使用。比如下面这个正则表达式的例子:
#include <iostream> #include <boost/regex.hpp> int main(int argc, const char * argv[]) { std::string str = "2013-08-15"; boost::regex rex("(?<year>[0-9]{4}).*(?<month>[0-9]{2}).*(?<day>[0-9]{2})"); boost::smatch res; std::string::const_iterator begin = str.begin(); std::string::const_iterator end = str.end(); if (boost::regex_search(begin, end, res, rex)) { std::cout << "Day: " << res ["day"] << std::endl << "Month: " << res ["month"] << std::endl << "Year: " << res ["year"] << std::endl; } } 3.1 使用静态库
Build Setings - Other linker flags /usr/local/boost_1_63_0/stage/lib/libboost_regex.a
使用命令行编译相当于
c++ -I /usr/local/boost_1_63_0 main.cpp -o main /usr/local/boost_1_63_0/stage/lib/libboost_regex.a ./main 如果这里直接使用lboost_regex, Xcode默认加载动态库。实际运用中可以考虑将目录中的动态库删除，只保留静态库，并在Build Setings - Library Search Paths 增加lib文件目录。
3.2 使用动态库
- 在Build Setings - Library Search Paths 增加lib文件目录
- 将lib文件目录中的libboost_regex.dylib文件拖入项目
- 确保在Build Phases - Link Bindary With Libraries中已经有该库
- 在Build Phases - Copy Files, 复制libboost_regex.dylib到Products Directory
使用命令行编译相当于
c++ -I /usr/local/boost_1_63_0 main.cpp -o main -L/usr/local/boost_1_63_0/stage/lib/ -lboost_regex cp /usr/local/boost_1_63_0/stage/lib/libboost_regex.dylib ./ ./main 最终安装目录:
/usr/local/Cellar/boost/1.67.0_1 设置头文件为/usr/local/Cellar/boost/1.67.0_1/include/,库文件为/usr/local/Cellar/boost/1.67.0_1/lib/
使用brew安装结果:
brew install boost Updating Homebrew... ==> Downloading https://homebrew.bintray.com/bottles-portable-ruby/portable-ruby-2.3.7.leopard_64.bottle.tar.gz ######################################################################## 100.0% ==> Pouring portable-ruby-2.3.7.leopard_64.bottle.tar.gz ==> Homebrew is run entirely by unpaid volunteers. Please consider donating: https://github.com/Homebrew/brew#donations ==> Migrating tap caskroom/cask to homebrew/cask... Changing remote from https://github.com/Caskroom/homebrew-cask to https://github.com/Homebrew/homebrew-cask... Moving /usr/local/Homebrew/Library/Taps/caskroom/homebrew-cask to /usr/local/Homebrew/Library/Taps/homebrew/homebrew-cask... ==> Auto-updated Homebrew! Updated 4 taps (homebrew/science, homebrew/core, homebrew/services, homebrew/cask). ==> New Formulae amtk gptfdisk patchelf gmt@4 nuxeo zstd gnatsd nvc ==> Renamed Formulae cdiff -> ydiff php56 -> php@5.6 rebar@3 -> rebar3 crystal-lang -> crystal php70 -> php@7.0 saltstack -> salt geth -> ethereum php71 -> php@7.1 wpcli-completion -> wp-cli-completion latexila -> gnome-latex php72 -> php ==> Deleted Formulae arm ghc@8.0 llvm@3.8 python3 artifactory-cli-go gnupg@2.0 luciddb root@5 aws-cloudsearch go@1.6 mal4s ruby@1.9 bokken go@1.7 mimetic ruby@2.1 boot2docker gpg-agent monotone tomcat@8.0 boot2docker-completion i3 nazghul ufoai dirmngr i3status node@4 voltdb ecj llvm@3.7 picolisp wry ==> Downloading https://homebrew.bintray.com/bottles/boost-1.67.0_1.high_sierra.bottle.tar.gz ######################################################################## 100.0% ==> Pouring boost-1.67.0_1.high_sierra.bottle.tar.gz Error: The `brew link` step did not complete successfully The formula built, but is not symlinked into /usr/local Could not symlink include/boost/accumulators/accumulators.hpp Target /usr/local/include/boost/accumulators/accumulators.hpp is a symlink belonging to boost. You can unlink it: brew unlink boost To force the link and overwrite all conflicting files: brew link --overwrite boost To list all files that would be deleted: brew link --overwrite --dry-run boost Possible conflicting files are: /usr/local/include/boost/accumulators/accumulators.hpp -> /usr/local/Cellar/boost/1.60.0_2/include/boost/accumulators/accumulators.hpp /usr/local/include/boost/accumulators/accumulators_fwd.hpp -> /usr/local/Cellar/boost/1.60.0_2/include/boost/accumulators/accumulators_fwd.hpp /usr/local/include/boost/accumulators/framework/accumulator_base.hpp -> /usr/local/Cellar/boost/1.60.0_2/include/boost/accumulators/framework/accumulator_base.hpp ... ==> Summary 🍺 /usr/local/Cellar/boost/1.67.0_1: 13,506 files, 450.9MB 