青岛官网建站,typecho 和WordPress,wordpress更改数据库域名链接,网络营销考试题及答案任何定义了函数调用操作符的对象都是函数对象。C 支持创建、操作新的函数对象#xff0c;同时也提供了许多内置的函数对象。 运算符函数对象
C 针对常用的算术和逻辑运算定义了很多函数对象#xff1a; 位运算
实现 x ^ y 的函数对象
std::bit_xor template class T 支持创建、操作新的函数对象同时也提供了许多内置的函数对象。 运算符函数对象
C 针对常用的算术和逻辑运算定义了很多函数对象 位运算
实现 x ^ y 的函数对象
std::bit_xor template class T struct bit_xor; (C14 前) template class T void struct bit_xor; (C14 起)
进行逐位异或的函数对象。等效地调用类型 T 上的 operator^ 。
特化 标准化提供 std::bit_xor 在不指定 T 时的特化它使得参数类型和返回类型留待推导。 bit_xorvoid 实现 x ^ y 并推导参数和返回类型的函数对象 (类模板特化)(C14 起) 成员类型 类型定义result_type(C17 中弃用)Tfirst_argument_type(C17 中弃用)Tsecond_argument_type(C17 中弃用)T(C20 前)
成员函数 operator() 返回二个参数逐位异或的结果 (公开成员函数) std::bit_xor::operator() T operator()( const T lhs, const T rhs ) const; (C14 前) constexpr T operator()( const T lhs, const T rhs ) const; (C14 起)
返回 lhs 与 rhs 逐位异或的结果。
参数
lhs, rhs-要计算逐位异或的值
返回值
lhs ^ rhs 的结果。
异常
无
可能的实现
constexpr T operator()(const T lhs, const T rhs) const
{return lhs ^ rhs;
} 调用示例
#include iostream
#include functionalstruct Cell
{int x;int y;Cell() default;Cell(int a, int b): x(a), y(b) {}Cell(const Cell cell){x cell.x;y cell.y;}Cell operator(const Cell cell){x cell.x;y cell.y;return *this;}Cell operator(const Cell cell){x cell.x;y cell.y;return *this;}Cell operator*(int n){x * n;y * n;return *this;}Cell operator(){x 1;y 1;return *this;}friend Cell operator (const Cell cell1, const Cell cell2){Cell cell cell1;cell cell2;return cell;}friend Cell operator *(const Cell cell1, const Cell cell2){Cell cell {cell1.x * cell2.x, cell1.y * cell2.y};return cell;}friend Cell operator /(const Cell cell1, const Cell cell2){Cell cell {cell1.x / cell2.x, cell1.y / cell2.y};return cell;}friend Cell operator %(const Cell cell1, const Cell cell2){Cell cell {cell1.x % cell2.x, cell1.y % cell2.y};return cell;}friend bool operator (const Cell cell1, const Cell cell2){return cell1.x cell2.x cell1.y cell2.y;}friend bool operator !(const Cell cell1, const Cell cell2){return cell1.x ! cell2.x cell1.y ! cell2.y;}friend bool operator (const Cell cell1, const Cell cell2){if (cell1.x cell2.x){return cell1.y cell2.y;}else{return cell1.x cell2.x;}}friend bool operator (const Cell cell1, const Cell cell2){if (cell1.x cell2.x){return cell1.y cell2.y;}else{return cell1.x cell2.x;}}friend bool operator (const Cell cell1, const Cell cell2){return cell1.x cell2.x cell1.y cell2.y;}friend bool operator ||(const Cell cell1, const Cell cell2){return cell1.x || cell2.x || cell1.y || cell2.y;}friend bool operator !(const Cell cell){return !(cell.x cell.x);}friend Cell operator (const Cell cell1, const Cell cell2){Cell cell {cell1.x cell2.x, cell1.y cell2.y};return cell;}friend Cell operator |(const Cell cell1, const Cell cell2){Cell cell {cell1.x | cell2.x, cell1.y | cell2.y};return cell;}friend Cell operator ^(const Cell cell1, const Cell cell2){Cell cell {cell1.x ^ cell2.x, cell1.y ^ cell2.y};return cell;}
};std::ostream operator(std::ostream os, const Cell cell)
{os { cell.x , cell.y };return os;
}int main()
{std::cout std::boolalpha;int *ptr nullptr;
// std::cout std::bit_xorint*()(ptr, nullptr):
// std::bit_xorint*()(ptr, nullptr) std::endl;std::cout std::bit_xorchar()(50, 2): std::bit_xorchar()(50, 2) std::endl;std::cout std::bit_xorchar()(a, 97): std::bit_xorchar()(a, 97) std::endl;std::cout std::bit_xorint()(1023, 1024): std::bit_xorint()(1023, 1024) std::endl;std::cout std::bit_xorlong()(1023, 1024): std::bit_xorlong()(1023, 1024) std::endl;std::cout std::bit_xorlong long()(1023, 1024): std::bit_xorlong long()(1023, 1024) std::endl;std::cout std::bit_xoruint8_t()(1023, 1024): std::bit_xoruint8_t()(8, 32) std::endl;std::cout std::bit_xoruint16_t()(123, 456): std::bit_xoruint16_t()(123, 456) std::endl;std::cout std::bit_xoruint32_t()(101, 202): std::bit_xoruint32_t()(101, 202) std::endl;std::cout std::bit_xoruint64_t()(10230, 10240): std::bit_xoruint64_t()(10230, 10240) std::endl;std::cout std::bit_xorint8_t()(1023, 1024): std::bit_xorint8_t()(8, 32) std::endl;std::cout std::bit_xorint16_t()(123, 456): std::bit_xorint16_t()(123, 456) std::endl;std::cout std::bit_xorint32_t()(101, 202): std::bit_xorint32_t()(101, 202) std::endl;std::cout std::bit_xorint64_t()(10230, 10240): std::bit_xorint64_t()(10230, 10240) std::endl;// std::cout std::bit_xordouble()(3.14, 3.14):
// std::bit_xordouble()(3.14, 3.14) std::endl;
// std::cout std::bit_xorfloat()(3.14, 3.14):
// std::bit_xorfloat()(3.14, 3.14) std::endl;
// std::cout std::bit_xorfloat()(3, 3):
// std::bit_xorfloat()(3, 3) std::endl;
// std::cout std::bit_xorfloat()(3.56, 3.14):
// std::bit_xorfloat()(3.56, 3.14) std::endl;
// std::cout std::bit_xorint()(3.14, 3.14):
// std::bit_xorint()(3.34, 3.34) std::endl;std::cout std::bit_xorCell()(Cell{101, 101}, Cell{202, 202}): std::bit_xorCell()(Cell{101, 101}, Cell{202, 202}) std::endl;//编译失败
// std::cout std::bit_xorstd::string()(\I am a \, \handsome programmer\):
// std::bit_xorstd::string()(I am a , handsome programmer) std::endl;return 0;
}输出
std::bit_xorchar()(50, 2): 0
std::bit_xorchar()(a, 97):
std::bit_xorint()(1023, 1024): 2047
std::bit_xorlong()(1023, 1024): 2047
std::bit_xorlong long()(1023, 1024): 2047
std::bit_xoruint8_t()(1023, 1024): (
std::bit_xoruint16_t()(123, 456): 435
std::bit_xoruint32_t()(101, 202): 175
std::bit_xoruint64_t()(10230, 10240): 4086
std::bit_xorint8_t()(1023, 1024): (
std::bit_xorint16_t()(123, 456): 435
std::bit_xorint32_t()(101, 202): 175
std::bit_xorint64_t()(10230, 10240): 4086
std::bit_xorCell()(Cell{101, 101}, Cell{202, 202}): {175,175}
