$ clang -dM -E -arch armv7 -x c /dev/null
#define OBJC_NEW_PROPERTIES 1
#define __APCS_32__ 1
#define __APPLE_CC__ 6000
#define __APPLE__ 1
#define __ARMEL__ 1
#define __ARM_ARCH 7
#define __ARM_ARCH_7A__ 1
#define __ARM_ARCH_PROFILE A
#define __ARM_NEON__ 1
#define __ARM_VFPV3__ 1
#define __ATOMIC_ACQUIRE 2
#define __ATOMIC_ACQ_REL 4
#define __ATOMIC_CONSUME 1
#define __ATOMIC_RELAXED 0
#define __ATOMIC_RELEASE 3
#define __ATOMIC_SEQ_CST 5
#define __BLOCKS__ 1
#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
#define __CHAR16_TYPE__ unsigned short
#define __CHAR32_TYPE__ unsigned int
#define __CHAR_BIT__ 8
#define __CONSTANT_CFSTRINGS__ 1
#define __DBL_DENORM_MIN__ 4.9406564584124654e-324
#define __DBL_DIG__ 15
#define __DBL_EPSILON__ 2.2204460492503131e-16
#define __DBL_HAS_DENORM__ 1
#define __DBL_HAS_INFINITY__ 1
#define __DBL_HAS_QUIET_NAN__ 1
#define __DBL_MANT_DIG__ 53
#define __DBL_MAX_10_EXP__ 308
#define __DBL_MAX_EXP__ 1024
#define __DBL_MAX__ 1.7976931348623157e+308
#define __DBL_MIN_10_EXP__ (-307)
#define __DBL_MIN_EXP__ (-1021)
#define __DBL_MIN__ 2.2250738585072014e-308
#define __DECIMAL_DIG__ 17
#define __DYNAMIC__ 1
#define __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ 50000
#define __FINITE_MATH_ONLY__ 0
#define __FLT_DENORM_MIN__ 1.40129846e-45F
#define __FLT_DIG__ 6
#define __FLT_EPSILON__ 1.19209290e-7F
#define __FLT_EVAL_METHOD__ 0
#define __FLT_HAS_DENORM__ 1
#define __FLT_HAS_INFINITY__ 1
#define __FLT_HAS_QUIET_NAN__ 1
#define __FLT_MANT_DIG__ 24
#define __FLT_MAX_10_EXP__ 38
#define __FLT_MAX_EXP__ 128
#define __FLT_MAX__ 3.40282347e+38F
#define __FLT_MIN_10_EXP__ (-37)
#define __FLT_MIN_EXP__ (-125)
#define __FLT_MIN__ 1.17549435e-38F
#define __FLT_RADIX__ 2
#define __GCC_ATOMIC_BOOL_LOCK_FREE 2
#define __GCC_ATOMIC_CHAR16_T_LOCK_FREE 2
#define __GCC_ATOMIC_CHAR32_T_LOCK_FREE 2
#define __GCC_ATOMIC_CHAR_LOCK_FREE 2
#define __GCC_ATOMIC_INT_LOCK_FREE 2
#define __GCC_ATOMIC_LLONG_LOCK_FREE 1
#define __GCC_ATOMIC_LONG_LOCK_FREE 2
#define __GCC_ATOMIC_POINTER_LOCK_FREE 2
#define __GCC_ATOMIC_SHORT_LOCK_FREE 2
#define __GCC_ATOMIC_TEST_AND_SET_TRUEVAL 1
#define __GCC_ATOMIC_WCHAR_T_LOCK_FREE 2
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1 1
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2 1
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 1
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8 1
#define __GNUC_MINOR__ 2
#define __GNUC_PATCHLEVEL__ 1
#define __GNUC_STDC_INLINE__ 1
#define __GNUC__ 4
#define __GXX_ABI_VERSION 1002
#define __GXX_RTTI 1
#define __INT16_TYPE__ short
#define __INT32_TYPE__ int
#define __INT64_C_SUFFIX__ LL
#define __INT64_TYPE__ long long int
#define __INT8_TYPE__ char
#define __INTMAX_MAX__ 9223372036854775807LL
#define __INTMAX_TYPE__ long long int
#define __INTMAX_WIDTH__ 64
#define __INTPTR_TYPE__ long int
#define __INTPTR_WIDTH__ 32
#define __INT_MAX__ 2147483647
#define __LDBL_DENORM_MIN__ 4.9406564584124654e-324L
#define __LDBL_DIG__ 15
#define __LDBL_EPSILON__ 2.2204460492503131e-16L
#define __LDBL_HAS_DENORM__ 1
#define __LDBL_HAS_INFINITY__ 1
#define __LDBL_HAS_QUIET_NAN__ 1
#define __LDBL_MANT_DIG__ 53
#define __LDBL_MAX_10_EXP__ 308
#define __LDBL_MAX_EXP__ 1024
#define __LDBL_MAX__ 1.7976931348623157e+308L
#define __LDBL_MIN_10_EXP__ (-307)
#define __LDBL_MIN_EXP__ (-1021)
#define __LDBL_MIN__ 2.2250738585072014e-308L
#define __LITTLE_ENDIAN__ 1
#define __LONG_LONG_MAX__ 9223372036854775807LL
#define __LONG_MAX__ 2147483647L
#define __MACH__ 1
#define __NO_INLINE__ 1
#define __ORDER_BIG_ENDIAN__ 4321
#define __ORDER_LITTLE_ENDIAN__ 1234
#define __ORDER_PDP_ENDIAN__ 3412
#define __PIC__ 2
#define __POINTER_WIDTH__ 32
#define __PRAGMA_REDEFINE_EXTNAME 1
#define __PTRDIFF_TYPE__ int
#define __PTRDIFF_WIDTH__ 32
#define __REGISTER_PREFIX__
#define __SCHAR_MAX__ 127
#define __SHRT_MAX__ 32767
#define __SIG_ATOMIC_WIDTH__ 32
#define __SIZEOF_DOUBLE__ 8
#define __SIZEOF_FLOAT__ 4
#define __SIZEOF_INT__ 4
#define __SIZEOF_LONG_DOUBLE__ 8
#define __SIZEOF_LONG_LONG__ 8
#define __SIZEOF_LONG__ 4
#define __SIZEOF_POINTER__ 4
#define __SIZEOF_PTRDIFF_T__ 4
#define __SIZEOF_SHORT__ 2
#define __SIZEOF_SIZE_T__ 4
#define __SIZEOF_WCHAR_T__ 4
#define __SIZEOF_WINT_T__ 4
#define __SIZE_MAX__ 4294967295UL
#define __SIZE_TYPE__ long unsigned int
#define __SIZE_WIDTH__ 32
#define __SSP__ 1
#define __STDC_HOSTED__ 1
#define __STDC_UTF_16__ 1
#define __STDC_UTF_32__ 1
#define __STDC_VERSION__ 199901L
#define __STDC__ 1
#define __THUMBEL__ 1
#define __THUMB_INTERWORK__ 1
#define __UINTMAX_TYPE__ long long unsigned int
#define __USER_LABEL_PREFIX__ _
#define __USING_SJLJ_EXCEPTIONS__ 1
#define __VERSION__ "4.2.1 Compatible Apple LLVM 5.1 (clang-503.0.40)"
#define __VFP_FP__ 1
#define __WCHAR_MAX__ 2147483647
#define __WCHAR_TYPE__ int
#define __WCHAR_WIDTH__ 32
#define __WINT_TYPE__ int
#define __WINT_WIDTH__ 32
#define __apple_build_version__ 5030040
#define __arm 1
#define __arm__ 1
#define __block __attribute__((__blocks__(byref)))
#define __clang__ 1
#define __clang_major__ 5
#define __clang_minor__ 1
#define __clang_patchlevel__ 0
#define __clang_version__ "5.1 (clang-503.0.40)"
#define __llvm__ 1
#define __pic__ 2
#define __strong
#define __thumb2__ 1
#define __thumb__ 1
#define __unsafe_unretained
#define __weak __attribute__((objc_gc(weak)))

$ clang -dM -E -arch armv7s -x c /dev/null
#define OBJC_NEW_PROPERTIES 1
#define __APCS_32__ 1
#define __APPLE_CC__ 6000
#define __APPLE__ 1
#define __ARMEL__ 1
#define __ARM_ARCH 7
#define __ARM_ARCH_7S__ 1
#define __ARM_ARCH_EXT_IDIV__ 1
#define __ARM_NEON__ 1
#define __ARM_VFPV4__ 1
#define __ATOMIC_ACQUIRE 2
#define __ATOMIC_ACQ_REL 4
#define __ATOMIC_CONSUME 1
#define __ATOMIC_RELAXED 0
#define __ATOMIC_RELEASE 3
#define __ATOMIC_SEQ_CST 5
#define __BLOCKS__ 1
#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
#define __CHAR16_TYPE__ unsigned short
#define __CHAR32_TYPE__ unsigned int
#define __CHAR_BIT__ 8
#define __CONSTANT_CFSTRINGS__ 1
#define __DBL_DENORM_MIN__ 4.9406564584124654e-324
#define __DBL_DIG__ 15
#define __DBL_EPSILON__ 2.2204460492503131e-16
#define __DBL_HAS_DENORM__ 1
#define __DBL_HAS_INFINITY__ 1
#define __DBL_HAS_QUIET_NAN__ 1
#define __DBL_MANT_DIG__ 53
#define __DBL_MAX_10_EXP__ 308
#define __DBL_MAX_EXP__ 1024
#define __DBL_MAX__ 1.7976931348623157e+308
#define __DBL_MIN_10_EXP__ (-307)
#define __DBL_MIN_EXP__ (-1021)
#define __DBL_MIN__ 2.2250738585072014e-308
#define __DECIMAL_DIG__ 17
#define __DYNAMIC__ 1
#define __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ 50000
#define __FINITE_MATH_ONLY__ 0
#define __FLT_DENORM_MIN__ 1.40129846e-45F
#define __FLT_DIG__ 6
#define __FLT_EPSILON__ 1.19209290e-7F
#define __FLT_EVAL_METHOD__ 0
#define __FLT_HAS_DENORM__ 1
#define __FLT_HAS_INFINITY__ 1
#define __FLT_HAS_QUIET_NAN__ 1
#define __FLT_MANT_DIG__ 24
#define __FLT_MAX_10_EXP__ 38
#define __FLT_MAX_EXP__ 128
#define __FLT_MAX__ 3.40282347e+38F
#define __FLT_MIN_10_EXP__ (-37)
#define __FLT_MIN_EXP__ (-125)
#define __FLT_MIN__ 1.17549435e-38F
#define __FLT_RADIX__ 2
#define __GCC_ATOMIC_BOOL_LOCK_FREE 2
#define __GCC_ATOMIC_CHAR16_T_LOCK_FREE 2
#define __GCC_ATOMIC_CHAR32_T_LOCK_FREE 2
#define __GCC_ATOMIC_CHAR_LOCK_FREE 2
#define __GCC_ATOMIC_INT_LOCK_FREE 2
#define __GCC_ATOMIC_LLONG_LOCK_FREE 1
#define __GCC_ATOMIC_LONG_LOCK_FREE 2
#define __GCC_ATOMIC_POINTER_LOCK_FREE 2
#define __GCC_ATOMIC_SHORT_LOCK_FREE 2
#define __GCC_ATOMIC_TEST_AND_SET_TRUEVAL 1
#define __GCC_ATOMIC_WCHAR_T_LOCK_FREE 2
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_1 1
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_2 1
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4 1
#define __GCC_HAVE_SYNC_COMPARE_AND_SWAP_8 1
#define __GNUC_MINOR__ 2
#define __GNUC_PATCHLEVEL__ 1
#define __GNUC_STDC_INLINE__ 1
#define __GNUC__ 4
#define __GXX_ABI_VERSION 1002
#define __GXX_RTTI 1
#define __INT16_TYPE__ short
#define __INT32_TYPE__ int
#define __INT64_C_SUFFIX__ LL
#define __INT64_TYPE__ long long int
#define __INT8_TYPE__ char
#define __INTMAX_MAX__ 9223372036854775807LL
#define __INTMAX_TYPE__ long long int
#define __INTMAX_WIDTH__ 64
#define __INTPTR_TYPE__ long int
#define __INTPTR_WIDTH__ 32
#define __INT_MAX__ 2147483647
#define __LDBL_DENORM_MIN__ 4.9406564584124654e-324L
#define __LDBL_DIG__ 15
#define __LDBL_EPSILON__ 2.2204460492503131e-16L
#define __LDBL_HAS_DENORM__ 1
#define __LDBL_HAS_INFINITY__ 1
#define __LDBL_HAS_QUIET_NAN__ 1
#define __LDBL_MANT_DIG__ 53
#define __LDBL_MAX_10_EXP__ 308
#define __LDBL_MAX_EXP__ 1024
#define __LDBL_MAX__ 1.7976931348623157e+308L
#define __LDBL_MIN_10_EXP__ (-307)
#define __LDBL_MIN_EXP__ (-1021)
#define __LDBL_MIN__ 2.2250738585072014e-308L
#define __LITTLE_ENDIAN__ 1
#define __LONG_LONG_MAX__ 9223372036854775807LL
#define __LONG_MAX__ 2147483647L
#define __MACH__ 1
#define __NO_INLINE__ 1
#define __ORDER_BIG_ENDIAN__ 4321
#define __ORDER_LITTLE_ENDIAN__ 1234
#define __ORDER_PDP_ENDIAN__ 3412
#define __PIC__ 2
#define __POINTER_WIDTH__ 32
#define __PRAGMA_REDEFINE_EXTNAME 1
#define __PTRDIFF_TYPE__ int
#define __PTRDIFF_WIDTH__ 32
#define __REGISTER_PREFIX__
#define __SCHAR_MAX__ 127
#define __SHRT_MAX__ 32767
#define __SIG_ATOMIC_WIDTH__ 32
#define __SIZEOF_DOUBLE__ 8
#define __SIZEOF_FLOAT__ 4
#define __SIZEOF_INT__ 4
#define __SIZEOF_LONG_DOUBLE__ 8
#define __SIZEOF_LONG_LONG__ 8
#define __SIZEOF_LONG__ 4
#define __SIZEOF_POINTER__ 4
#define __SIZEOF_PTRDIFF_T__ 4
#define __SIZEOF_SHORT__ 2
#define __SIZEOF_SIZE_T__ 4
#define __SIZEOF_WCHAR_T__ 4
#define __SIZEOF_WINT_T__ 4
#define __SIZE_MAX__ 4294967295UL
#define __SIZE_TYPE__ long unsigned int
#define __SIZE_WIDTH__ 32
#define __SSP__ 1
#define __STDC_HOSTED__ 1
#define __STDC_UTF_16__ 1
#define __STDC_UTF_32__ 1
#define __STDC_VERSION__ 199901L
#define __STDC__ 1
#define __THUMBEL__ 1
#define __THUMB_INTERWORK__ 1
#define __UINTMAX_TYPE__ long long unsigned int
#define __USER_LABEL_PREFIX__ _
#define __USING_SJLJ_EXCEPTIONS__ 1
#define __VERSION__ "4.2.1 Compatible Apple LLVM 5.1 (clang-503.0.40)"
#define __VFP_FP__ 1
#define __WCHAR_MAX__ 2147483647
#define __WCHAR_TYPE__ int
#define __WCHAR_WIDTH__ 32
#define __WINT_TYPE__ int
#define __WINT_WIDTH__ 32
#define __apple_build_version__ 5030040
#define __arm 1
#define __arm__ 1
#define __block __attribute__((__blocks__(byref)))
#define __clang__ 1
#define __clang_major__ 5
#define __clang_minor__ 1
#define __clang_patchlevel__ 0
#define __clang_version__ "5.1 (clang-503.0.40)"
#define __llvm__ 1
#define __pic__ 2
#define __strong
#define __thumb2__ 1
#define __thumb__ 1
#define __unsafe_unretained
#define __weak __attribute__((objc_gc(weak)))

$ clang -dM -E -arch arm64 -x c /dev/null
#define OBJC_NEW_PROPERTIES 1
#define _LP64 1
#define __AARCH64_SIMD__ 1
#define __APPLE_CC__ 6000
#define __APPLE__ 1
#define __ARM64_ARCH_8__ 1
#define __ARM_NEON__ 1
#define __ATOMIC_ACQUIRE 2
#define __ATOMIC_ACQ_REL 4
#define __ATOMIC_CONSUME 1
#define __ATOMIC_RELAXED 0
#define __ATOMIC_RELEASE 3
#define __ATOMIC_SEQ_CST 5
#define __BLOCKS__ 1
#define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__
#define __CHAR16_TYPE__ unsigned short
#define __CHAR32_TYPE__ unsigned int
#define __CHAR_BIT__ 8
#define __CONSTANT_CFSTRINGS__ 1
#define __DBL_DENORM_MIN__ 4.9406564584124654e-324
#define __DBL_DIG__ 15
#define __DBL_EPSILON__ 2.2204460492503131e-16
#define __DBL_HAS_DENORM__ 1
#define __DBL_HAS_INFINITY__ 1
#define __DBL_HAS_QUIET_NAN__ 1
#define __DBL_MANT_DIG__ 53
#define __DBL_MAX_10_EXP__ 308
#define __DBL_MAX_EXP__ 1024
#define __DBL_MAX__ 1.7976931348623157e+308
#define __DBL_MIN_10_EXP__ (-307)
#define __DBL_MIN_EXP__ (-1021)
#define __DBL_MIN__ 2.2250738585072014e-308
#define __DECIMAL_DIG__ 17
#define __DYNAMIC__ 1
#define __ENVIRONMENT_IPHONE_OS_VERSION_MIN_REQUIRED__ 50000
#define __FINITE_MATH_ONLY__ 0
#define __FLT_DENORM_MIN__ 1.40129846e-45F
#define __FLT_DIG__ 6
#define __FLT_EPSILON__ 1.19209290e-7F
#define __FLT_EVAL_METHOD__ 0
#define __FLT_HAS_DENORM__ 1
#define __FLT_HAS_INFINITY__ 1
#define __FLT_HAS_QUIET_NAN__ 1
#define __FLT_MANT_DIG__ 24
#define __FLT_MAX_10_EXP__ 38
#define __FLT_MAX_EXP__ 128
#define __FLT_MAX__ 3.40282347e+38F
#define __FLT_MIN_10_EXP__ (-37)
#define __FLT_MIN_EXP__ (-125)
#define __FLT_MIN__ 1.17549435e-38F
#define __FLT_RADIX__ 2
#define __GCC_ATOMIC_BOOL_LOCK_FREE 2
#define __GCC_ATOMIC_CHAR16_T_LOCK_FREE 2
#define __GCC_ATOMIC_CHAR32_T_LOCK_FREE 2
#define __GCC_ATOMIC_CHAR_LOCK_FREE 2
#define __GCC_ATOMIC_INT_LOCK_FREE 2
#define __GCC_ATOMIC_LLONG_LOCK_FREE 2
#define __GCC_ATOMIC_LONG_LOCK_FREE 2
#define __GCC_ATOMIC_POINTER_LOCK_FREE 2
#define __GCC_ATOMIC_SHORT_LOCK_FREE 2
#define __GCC_ATOMIC_TEST_AND_SET_TRUEVAL 1
#define __GCC_ATOMIC_WCHAR_T_LOCK_FREE 2
#define __GNUC_MINOR__ 2
#define __GNUC_PATCHLEVEL__ 1
#define __GNUC_STDC_INLINE__ 1
#define __GNUC__ 4
#define __GXX_ABI_VERSION 1002
#define __GXX_RTTI 1
#define __INT16_TYPE__ short
#define __INT32_TYPE__ int
#define __INT64_C_SUFFIX__ LL
#define __INT64_TYPE__ long long int
#define __INT8_TYPE__ char
#define __INTMAX_MAX__ 9223372036854775807L
#define __INTMAX_TYPE__ long int
#define __INTMAX_WIDTH__ 64
#define __INTPTR_TYPE__ long int
#define __INTPTR_WIDTH__ 64
#define __INT_MAX__ 2147483647
#define __LDBL_DENORM_MIN__ 4.9406564584124654e-324L
#define __LDBL_DIG__ 15
#define __LDBL_EPSILON__ 2.2204460492503131e-16L
#define __LDBL_HAS_DENORM__ 1
#define __LDBL_HAS_INFINITY__ 1
#define __LDBL_HAS_QUIET_NAN__ 1
#define __LDBL_MANT_DIG__ 53
#define __LDBL_MAX_10_EXP__ 308
#define __LDBL_MAX_EXP__ 1024
#define __LDBL_MAX__ 1.7976931348623157e+308L
#define __LDBL_MIN_10_EXP__ (-307)
#define __LDBL_MIN_EXP__ (-1021)
#define __LDBL_MIN__ 2.2250738585072014e-308L
#define __LITTLE_ENDIAN__ 1
#define __LONG_LONG_MAX__ 9223372036854775807LL
#define __LONG_MAX__ 9223372036854775807L
#define __LP64__ 1
#define __MACH__ 1
#define __NO_INLINE__ 1
#define __ORDER_BIG_ENDIAN__ 4321
#define __ORDER_LITTLE_ENDIAN__ 1234
#define __ORDER_PDP_ENDIAN__ 3412
#define __PIC__ 2
#define __POINTER_WIDTH__ 64
#define __PRAGMA_REDEFINE_EXTNAME 1
#define __PTRDIFF_TYPE__ long int
#define __PTRDIFF_WIDTH__ 64
#define __REGISTER_PREFIX__
#define __SCHAR_MAX__ 127
#define __SHRT_MAX__ 32767
#define __SIG_ATOMIC_WIDTH__ 32
#define __SIZEOF_DOUBLE__ 8
#define __SIZEOF_FLOAT__ 4
#define __SIZEOF_INT128__ 16
#define __SIZEOF_INT__ 4
#define __SIZEOF_LONG_DOUBLE__ 8
#define __SIZEOF_LONG_LONG__ 8
#define __SIZEOF_LONG__ 8
#define __SIZEOF_POINTER__ 8
#define __SIZEOF_PTRDIFF_T__ 8
#define __SIZEOF_SHORT__ 2
#define __SIZEOF_SIZE_T__ 8
#define __SIZEOF_WCHAR_T__ 4
#define __SIZEOF_WINT_T__ 4
#define __SIZE_MAX__ 18446744073709551615UL
#define __SIZE_TYPE__ long unsigned int
#define __SIZE_WIDTH__ 64
#define __SSP__ 1
#define __STDC_HOSTED__ 1
#define __STDC_UTF_16__ 1
#define __STDC_UTF_32__ 1
#define __STDC_VERSION__ 199901L
#define __STDC__ 1
#define __UINTMAX_TYPE__ long unsigned int
#define __USER_LABEL_PREFIX__ _
#define __VERSION__ "4.2.1 Compatible Apple LLVM 5.1 (clang-503.0.40)"
#define __WCHAR_MAX__ 2147483647
#define __WCHAR_TYPE__ int
#define __WCHAR_WIDTH__ 32
#define __WINT_TYPE__ int
#define __WINT_WIDTH__ 32
#define __aarch64__ 1
#define __apple_build_version__ 5030040
#define __arm64 1
#define __arm64__ 1
#define __block __attribute__((__blocks__(byref)))
#define __clang__ 1
#define __clang_major__ 5
#define __clang_minor__ 1
#define __clang_patchlevel__ 0
#define __clang_version__ "5.1 (clang-503.0.40)"
#define __llvm__ 1
#define __pic__ 2
#define __strong
#define __unsafe_unretained
#define __weak __attribute__((objc_gc(weak)))

xcode 编译器在各个arch下面默认宏的更多相关文章

  1. C++编译器何时为用户提供默认构造函数

    第一种是类成员中有成员是类对象,并且该成员的类含有默认构造函数,那么C++编译器会帮你给这个类也生成一个默认构造函数,用来调用其成员对象的构造函数,完成该成员的初始化构造.需要强调的是,如果这个成员的 ...

  2. C++ //构造函数调用规则 //1.创建一个类，C++编译器会给每个类添加至少3个函数 //默认构造（空实现） //析构函数（空实现） //拷贝函数（值拷贝） //2.如果我们写了有参构造函数 编译器就不会提供默认构造函数 但是会提供拷贝构造函数 //3.如果我们写了拷贝函数 编译器就不再提供 默认 有参 构造函数

    //构造函数调用规则 #include <iostream> using namespace std; //1.创建一个类,C++编译器会给每个类添加至少3个函数 //默认构造(空实现) ...

  3. 查看gcc的默认宏定义命令【转】

    转自:http://blog.csdn.net/cywosp/article/details/10730931 有些时候我们在编写代码或者阅读开源项目时经常会遇到一些陌生的宏定义,在找遍所有源代码都没 ...

  4. 更改arch的默认终端

    实在是厌倦了gnome的资源管理器nautilus和终端gnome-terminal,于是卸载之,然后更换了xfce4的终端,但是出现了一个问题,那就是在资源管理器中使用邮件打开终端的时候打不开了,解 ...

  5. xcode 配置系统环境变量 Preporocessing 预编译宏的另一种写法, 系统的DEBUG 由来

    在某些项目中看到一些环境变量类似宏的东西 比如叫ENVIRONMENT, 但发现还找不到具体这个宏是什么值, 那是因为他实在Preprocessing里配置了这个宏的值, 他能配置debug/rele ...

  6. C++中的空类，编译器默认可以产生哪些成员函数

    C++中的空类,编译器默认可以产生哪些成员函数 C++中创建一个空类:class Empty {};默认会生成4个函数,其函数的原型如下: public: Empty() { ... } Empty( ...

  7. C++编译器会对没有构造函数的类生成默认构造函数吗？（有必要的时候才生成，要看情况。有反汇编验证）

    之前在上C++的课的时候,印象中有那么一句话:如果一个类没有任何构造函数,那么编译器会生成一个默认的构造函数 今天在看<深度探索C++对象模型>的第二章:“构造函数语意学”的时候发现之前听 ...

  8. Objective-C学习备忘录：Clang编译器编译运行Objective－C代码

    我们都知道可以通过Apple公司的Xcode工具来学习Objective-C编程语言,但是能不能脱离XCode这个IDE进行Objective-C学习呢?当然是可以的.首先作为计算机科班出身的程序员都 ...

  9. C中的预编译宏定义

     可以用宏判断是否为ARC环境 #if _has_feature(objc_arc) #else //MRC #endif C中的预编译宏定义 -- 作者: infobillows 来源:网络 在将一 ...

随机推荐

  1. 纯css径向渐变(CSS3--Gradient)

    渐变 一.CSS3的径向渐变 效果图网址:http://www.spritecow.com 图像拼接技术 CSS3 Gradient分为linear-gradient(线性渐变)和radial-gra ...

  2. JAVA程序提示错误：需要class，interface或enum解决方法

    错误详情: 解决办法:主要是用非记事本编写代码文件,存在编码格式转换问题.重新先建一个记事本程序,然后把源代码粘贴到该文件下,用javac 类名.java编译,java 文件名运行该程序即可

  3. linux环境变量查看及修改

    例如用命令 echo $PATH 则可以查看该环境变量为/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin 添加环境定义一个变量 ...

  4. python 静态方法，类方法 ，类的继承

    转自:  http://cowboy.1988.blog.163.com/blog/static/75105798201091141521583/ 1.关于定义类的一些奇特之处  今天在Python中 ...

  5. Windows Phone 8.1 新特性 - 控件之应用程序栏

    2014年4月3日的微软Build 2014 大会上,Windows Phone 8.1 正式发布.相较于Windows Phone 8,不论从用户还是开发者的角度,都产生了很大的变化.接下来我们会用 ...

  6. sscanf函数用法详解

    sscanf() - 从一个字符串中读进与指定格式相符的数据. 函数原型: Int sscanf( string str, string fmt, mixed var1, mixed var2 ... ...

  7. IOS block使用中碰到的一个小坑

    1.先上段代码       __block typeof(self) tmpSelf = self; [tableview addLegendHeaderWithRefreshingBlock:^() ...

  8. 动态时间归整/规整/弯曲(Dynamic time warping,DTW)

    动态时间规整DTW   在日常的生活中我们最经常使用的距离毫无疑问应该是欧式距离,但是对于一些特殊情况,欧氏距离存在着其很明显的缺陷,比如说时间序列,举个比较简单的例子,序列A:1,1,1,10,2, ...

  9. 502 Server dropped connection

    在本地电脑上开启了,全局VPN代理后,出现 502 报错. 502 Server dropped connection The following error occurred while tryin ...

  10. “System.Web.UI.WebControls.Literal”不允许使用子控件

    今天在写下面的代码时遭遇错误——“System.Web.UI.WebControls.Literal”不允许使用子控件('System.Web.UI.WebControls.Literal' does ...