C/C++¶
Doxygen¶
Protobuf¶
# ubuntu install protobuf
sudo apt-get install libprotobuf-dev
sudo apt-get install protobuf-compiler
#
g++ write.cpp addressbook.pb.cc -o write `pkg-config --cflags --libs protobuf`
g++ read.cpp addressbook.pb.cc -o read `pkg-config --cflags --libs protobuf`
SRC_DIR:=../../proto
DST_DIR:=.
all:
protoc -I=${SRC_DIR} --cpp_out=${DST_DIR} ${SRC_DIR}/gps_path_tracking.proto
protoc -I=${SRC_DIR} --python_out=${DST_DIR} ${SRC_DIR}/gps_path_tracking.proto
# Qt .pro add this line
unix|win32: LIBS += -pthread -lprotobuf -pthread -lpthread
boost¶
sudo apt-get install libboost-all-dev
g++ test.cpp -lboost_system -lboost_filesystem
C/C++编译器的预定义宏¶
#include <stdio.h>
#define PT_MAKE_STR(x) { #x, PT_MAKE_STR_ESC(x) }
#define PT_MAKE_STR_ESC(x) #x
typedef struct
{
const char *name;
const char *value;
} MACRO_T;
/* Compilers */const MACRO_T g_compilers[ ] =
{
#ifdef __INTEL_COMPILER /* Interl C++ */
PT_MAKE_STR( __INTEL_COMPILER ),
#endif
#ifdef _MSC_VER /* Visual C++ */
PT_MAKE_STR( _MSC_VER ),
#endif
#ifdef __GNUC__ /* GCC */
PT_MAKE_STR( __GNUC__ ),
#endif
#ifdef __DMC__ /* DMC++ */
PT_MAKE_STR( __DMC__ ),
#endif
#ifdef __ARMCC_VERSION /* ARM C/C++ */
PT_MAKE_STR( __ARMCC_VERSION ),
#endif
};
/* Operation system */const MACRO_T g_platforms[ ] =
{
#ifdef __i386__
PT_MAKE_STR(__i386__),
#endif
#ifdef __x86_64__
PT_MAKE_STR(__x86_64__),
#endif
#ifdef __AMD64__
PT_MAKE_STR(__AMD64__),
#endif
#ifdef __amd64__
PT_MAKE_STR(__amd64__),
#endif
#ifdef __ia64__
PT_MAKE_STR(__ia64__),
#endif
#ifdef __alpha__
PT_MAKE_STR(__alpha__),
#endif
#ifdef __arm__
PT_MAKE_STR(__arm__),
#endif
#ifdef __sparc__
PT_MAKE_STR(__sparc__),
#endif
#ifdef __arch64__
PT_MAKE_STR(__arch64__),
#endif
#ifdef __aarch64__
PT_MAKE_STR( __aarch64__ ),
#endif
#ifdef __powerpc__
PT_MAKE_STR(__powerpc__),
#endif
#ifdef __powerpc64__
PT_MAKE_STR(__powerpc64__),
#endif
#ifdef __ppc__
PT_MAKE_STR(__ppc__),
#endif
#ifdef __ppc64__
PT_MAKE_STR(__ppc64__),
#endif
#ifdef _WIN32 /* Windows 32 or Windows 64 */
PT_MAKE_STR( _WIN32 ),
#endif
#ifdef _WIN64 /* Windows 64 */
PT_MAKE_STR( _WIN64 ),
#endif
#ifdef __MINGW32__ /* Windows32 by mingw compiler */
PT_MAKE_STR( __MINGW32__ ),
#endif
#ifdef __CYGWIN__ /* Cygwin */
PT_MAKE_STR( __CYGWIN__ ),
#endif
#ifdef __linux__ /* linux */
PT_MAKE_STR( __linux__ ),
#endif
#ifdef __FreeBSD__ /* FreeBSD */
PT_MAKE_STR( __FreeBSD__ ),
#endif
#ifdef __NetBSD__ /* NetBSD */
PT_MAKE_STR( __NetBSD__ ),
#endif
#ifdef __OpenBSD__ /* OpenBSD */
PT_MAKE_STR( __OpenBSD__ ),
#endif
#ifdef __sun__ /* Sun OS */
PT_MAKE_STR( __sun__ ),
#endif
#ifdef __MaxOSX__ /* MAC OS X */
PT_MAKE_STR( __MaxOSX__ ),
#endif
#ifdef __unix__ /* unix */
PT_MAKE_STR( __unix__ ),
#endif
};
/* Other useful */const MACRO_T g_others[ ] =
{
#ifdef __DATE__
PT_MAKE_STR( __DATE__ ),
#endif
#ifdef __TIME__
PT_MAKE_STR( __TIME__ ),
#endif
#ifdef _BSD_SOURCE
PT_MAKE_STR( _BSD_SOURCE ),
#endif
#ifdef _POSIX_SOURCE
PT_MAKE_STR( _POSIX_SOURCE ),
#endif
#ifdef _XOPEN_SOURCE
PT_MAKE_STR( _XOPEN_SOURCE ),
#endif
#ifdef _GNU_SOURCE
PT_MAKE_STR( _GNU_SOURCE ),
#endif
#ifdef __GNUC_MINOR__
PT_MAKE_STR( __GNUC_MINOR__ ),
#endif
#ifdef __VERSION__
PT_MAKE_STR( __VERSION__ ),
#endif
#ifdef __unix
PT_MAKE_STR( __unix ),
#endif
};
int main( int argc, char **argv )
{
int i;
printf( "/* Compiler definitions. */\n" );
for( i = 0; i < sizeof( g_compilers ) / sizeof( g_compilers[ 0 ] ); ++i )
{
printf( "#define %s %s\n", g_compilers[ i ].name, g_compilers[ i ].value );
}
printf( "\n" );
printf( "/* Platform definitions. */\n" );
for( i = 0; i < sizeof( g_platforms ) / sizeof( g_platforms[ 0 ] ); ++i )
{
printf( "#define %s %s\n", g_platforms[ i ].name, g_platforms[ i ].value );
}
printf( "\n" );
printf( "/* Other definitions. */\n" );
for( i = 0; i < sizeof( g_others ) / sizeof( g_others[ 0 ] ); ++i )
{
printf( "#define %s %s\n", g_others[ i ].name, g_others[ i ].value );
}
printf( "\n" );
return 0;
}
GeographicLib¶
// main.cpp
#include <iostream>
#include <exception>
#include <cmath>
#include <GeographicLib/Geocentric.hpp>
#include <GeographicLib/LocalCartesian.hpp>
#include <iomanip>
using namespace std;
using namespace GeographicLib;
int main() {
cout<<setiosflags(ios::fixed)<<setiosflags(ios::right)<<setprecision(8); //输出一个右对齐的小数点后两位的浮点数。
try {
Geocentric earth(Constants::WGS84_a(), Constants::WGS84_f());
// Alternatively: const Geocentric& earth = Geocentric::WGS84();
const double lat0 = 48 + 50/60.0, lon0 = 2 + 20/60.0; // Paris
LocalCartesian proj(lat0, lon0, 0, earth);
{
// Sample forward calculation
double lat = 50.9, lon = 1.8, h = 0; // Calais
double x, y, z;
proj.Forward(lat, lon, h, x, y, z);
cout << x << " " << y << " " << z << "\n";
}
{
// Sample reverse calculation
double x = -38e3, y = 230e3, z = -4e3;
double lat, lon, h;
proj.Reverse(x, y, z, lat, lon, h);
cout << lat << " " << lon << " " << h << "\n";
}
}
catch (const exception& e) {
cerr << "Caught exception: " << e.what() << "\n";
return 1;
}
}
apt-get install libgeographic-dev
g++ main.cpp `pkg-config --cflags --libs geographiclib`
# CMakeLists.txt
cmake_minimum_required(VERSION 3.5 FATAL_ERROR)
project(localCartesian_test LANGUAGES CXX)
#find_package(PkgConfig REQUIRED)
include(FindPkgConfig)
#pkg_search_module(GEOGRAPHICLIB REQUIRED IMPORTED_TARGET geographiclib>=1.49) # 检查包并使用第一个可用包
pkg_check_modules(GEOGRAPHICLIB REQUIRED IMPORTED_TARGET geographiclib>=1.49) # 检查所有相应的包
#include_directories(${GEOGRAPHICLIB_INCLUDE_DIRS})
include_directories(PkgConfig::GEOGRAPHICLIB)
add_executable(${PROJECT_NAME} main.cpp)
#target_link_libraries(${PROJECT_NAME} ${GEOGRAPHICLIB_LIBRARIES})
target_link_libraries(${PROJECT_NAME} PkgConfig::GEOGRAPHICLIB)
UTF-8是一种变长字节编码方式。
对于某一个字符的UTF-8编码，如果只有一个字节则其最高二进制位为0；
如果是多字节，其第一个字节从最高位开始，连续的二进制位值为1的个数决定了其编码的位数，
其余各字节均以10开头。UTF-8最多可用到6个字节。
如表：
1字节 0xxxxxxx
2字节 110xxxxx 10xxxxxx
3字节 1110xxxx 10xxxxxx 10xxxxxx
4字节 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx
5字节 111110xx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
6字节 1111110x 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx 10xxxxxx
因此UTF-8中可以用来表示字符编码的实际位数最多有31位，即上表中x所表示的位。
除去那些控制位（每字节开头的10等），这些x表示的位与UNICODE编码是一一对应的，位高低顺序也相同。
实际将UNICODE转换为UTF-8编码时应先去除高位0，然后根据所剩编码的位数决定所需最小的UTF-8编码位数。
因此那些基本ASCII字符集中的字符（UNICODE兼容ASCII）只需要一个字节的UTF-8编码（7个二进制位）便可以表示
gcc¶
- -Wno-unused-function: 发现不使用的函数不警告
- 全局环境变量（ C_INCLUDE_PATH / CPLUS_INCLUDE_PATH ）添加自定义的头文件路径
- -rpath: 用于指定运行动时态库搜索路径