c insert 和 push_back throw length问题

最新推荐文章于 2024-04-27 20:19:18 发布
原创 最新推荐文章于 2024-04-27 20:19:18 发布 · 207 阅读 · 0 ·
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#c

原来的样子是

               

std::vector<int> gids;
gids.insert(gids.end(), 
            nodes[i]->getLiftFloors().begin(),
            nodes[i]->getLiftFloors().end());
flagGIDS[flag] = gids;

这样的话会报错

修改成这个样子就没事了

for (unsigned  int j= 0; j < nodes[i]->getLiftFloors().size(); ++j)
{
    gids.push_back(nodes[i]->getLiftFloors()[j]);
}
flagGIDS[flag] = gids;

这是个玄学的问题，有知道的可以帮忙解释一下
 

（C语言）insert
hua12ng的博客
11-29 8793
insert 题目：实现在字符串的内部增加字符串。 void insert(char * s1,char * s2, int n); 将s2指向的字符串的拷贝，添加到s1第n个字符的位置，原位置的字符后移。n=0时，s2增加到s1的首部； n=s1的字符串长度时，s2增加到s1的末尾。 注意：使用空格字符来表示字符串的结束。 例如source指向位置，依次保存了字符’a’，字符’b’，字符空格’ ...
【c语言】函数insert将一个指定的单精度数按递减规律插入数组num中，注：数组num中已有12个按照递减顺序排好序的单精度数
qq_62755550的博客
12-16 1562
//函数insert将一个指定的单精度数按递减规律插入数组num中 //注 数组num中已有12个按照递减顺序排好序的单精度数 #include<stdio.h> #include<stdlib.h> #include<time.h> void insert(float num[13], float newnum); int main() { float nums[12]; srand((unsigned)time(NULL)); int i, j; for (.
c语言中insert函数,C ++ STL中的多集insert()函数
weixin_35032861的博客
05-21 1246
insert()C ++ STL中的多重集函数，可将元素从一个多重集到另一个多重集的位置从一个位置插入到另一个位置。使用的函数列表：ms.size()=返回多集的大小。ms.insert()=用于将元素插入多集。范例程式码#include#include#include#includeusingnamespacestd;intmain(){multisetms;multiset:...
insert函数
zhao_god的专栏
12-04 955
在C语言里如果想在集合里插入数据，比较麻烦，一般先把插入位置及以后的数据先后移动，然后再在该位置上插入新数据，过程需自己编写代码实现，Python下想对集合插入数据很简单用Insert函数就可以了，不需要写循环体移动数据，实际是Python在执行insert时帮大家完成了移动的操作。从运行结果可以看出在a列表位置为2的地方插入了数据100,而原来从2到最后的所有数据均向后移动了一个位置。列表.insert(位置，数据)
直接插入排序c/c++---InsertSort
qq_44416755的博客
03-15 470
/*插入排序 * *dev/c++ 输入结束 *按回车键 *再加上俩ctrl+z才能运行 */ #include&amp;lt;cstdio&amp;gt; #include&amp;lt;iostream&amp;gt; using namespace std; void insertSort(int a[],int len){ int temp; for(int i=0;i&amp;lt;len;i++){ temp...
std::vector<uint32_t> StringUtf8ExtraBytes::encode_string(std::string& input, std::vector<int>& indices, int seed = 0) { std::default_random_engine rand_engine(seed); std::uniform_int_distribution<int> dist(0); std::vector<uint32_t> result; for (size_t i = 0; i < input.size(); ++i) { char32_t ch = input[i]; uint32_t code_point = static_cast<uint32_t>(ch); int byte_count = ENCODE::get_byte_count(code_point); int mutated_count = byte_count; std::vector<uint32_t > encoded; bool selected_mutate = false; for (int idx : indices) { if (static_cast<size_t>(idx) == i + 1) { selected_mutate = true; break; } } if (selected_mutate) { std::uniform_int_distribution<int> mutation_dist(byte_count + 1, 6); mutated_count = mutation_dist(rand_engine); } switch (mutated_count) { case 1: encoded.push_back(static_cast<uint8_t>(code_point)); break; case 2: encoded.push_back(0xC0 | ((code_point >> 6) & 0x1F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; case 3: encoded.push_back(0xE0 | ((code_point >> 12) & 0x0F)); encoded.push_back(0x80 | ((code_point >> 6) & 0x3F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; case 4: encoded.push_back(0xF0 | ((code_point >> 18) & 0x07)); encoded.push_back(0x80 | ((code_point >> 12) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 6) & 0x3F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; case 5: encoded.push_back(0xF8 | ((code_point >> 24) & 0x03)); encoded.push_back(0x80 | ((code_point >> 18) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 12) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 6) & 0x3F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; case 6: encoded.push_back(0xFC | ((code_point >> 30) & 0x01)); encoded.push_back(0x80 | ((code_point >> 24) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 18) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 12) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 6) & 0x3F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; default: throw std::runtime_error("Unsupported value"); } result.insert(result.end(), encoded.begin(), encoded.end()); } return result; } void StringUtf8ExtraBytes::random_mutation(std::shared_ptr<StringBase> obj) { std::vector<uint8_t> string_bytes; for (char c : obj->value) { string_bytes.push_back(static_cast<uint8_t>(c)); } std::string unicode_str(string_bytes.begin(), string_bytes.end()); int num = pick_six(rand); int length = static_cast<int>(unicode_str.length()); int sample_count = std::min(num, length); std::vector<int> indices_all(length); std::iota(indices_all.begin(), indices_all.end(), 1); std::vector<int> indices(sample_count); std::sample(indices_all.begin(), indices_all.end(), indices.begin(), sample_count, rand); uint32_t str_mutated = encode_string(unicode_str, indices, rand()); obj->mutated_value = str_mutated; obj->mutated = true; }如何修改
07-04
你提供的代码中存在几个关键问题，导致编译或逻辑错误。我们来逐个分析并进行修复。 --- ## 问题分析 ### 1. **函数返回类型不匹配** ```cpp std::vector<uint32_t> StringUtf8ExtraBytes::encode_string(...) `...
你按照obj->mutated_value 是码点序列为我写出能够实现上面python代码功能的cpp代码，基于以下做修改：StringUtf8ExtraBytes::StringUtf8ExtraBytes(std::shared_ptr<StringBase> obj, std::mt19937 &rand) : total(obj->value.size()), encoding(obj->type) {} std::vector<uint8_t> StringUtf8ExtraBytes::encode_string(std::string& input, std::vector<int>& indices, int engine) { std::default_random_engine rand_engine(engine); std::vector<uint8_t> result; for (size_t i = 0; i < input.size(); ++i) { char32_t ch = input[i]; uint32_t code_point = static_cast<uint8_t>(ch); int byte_count = ENCODE::get_byte_count(code_point); int mutated_count = byte_count; std::vector<uint8_t > encoded; bool selected_mutate = false; for (int idx : indices) { if (static_cast<size_t>(idx) == i + 1) { selected_mutate = true; break; } } if (selected_mutate) { std::uniform_int_distribution<int> mutation_dist(byte_count + 1, 6); mutated_count = mutation_dist(rand_engine); } switch (mutated_count) { case 1: encoded.push_back(static_cast<uint8_t>(code_point)); break; case 2: encoded.push_back(0xC0 | ((code_point >> 6) & 0x1F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; case 3: encoded.push_back(0xE0 | ((code_point >> 12) & 0x0F)); encoded.push_back(0x80 | ((code_point >> 6) & 0x3F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; case 4: encoded.push_back(0xF0 | ((code_point >> 18) & 0x07)); encoded.push_back(0x80 | ((code_point >> 12) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 6) & 0x3F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; case 5: encoded.push_back(0xF8 | ((code_point >> 24) & 0x03)); encoded.push_back(0x80 | ((code_point >> 18) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 12) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 6) & 0x3F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; case 6: encoded.push_back(0xFC | ((code_point >> 30) & 0x01)); encoded.push_back(0x80 | ((code_point >> 24) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 18) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 12) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 6) & 0x3F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; default: throw std::runtime_error("Unsupported value"); } result.insert(result.end(), encoded.begin(), encoded.end()); } return result; } void StringUtf8ExtraBytes::random_mutation(std::shared_ptr<StringBase> obj) { std::random_device rd; std::mt19937 engine(rd()); std::string input(obj->value.data(), obj->value.size()); int num = pick_six(rand); int length = static_cast<int>(input.length()); int sample_count = std::min(num, length); std::vector<int> indices_all(length); std::iota(indices_all.begin(), indices_all.end(), 1); std::vector<int> indices(sample_count); std::sample(indices_all.begin(), indices_all.end(), std::back_inserter(indices), sample_count, rand); auto encoded_bytes = encode_string(input, indices, engine()); std::string str_mutated(encoded_bytes.begin(), encoded_bytes.end()); obj->mutated_value = str_mutated; obj->mutated = true; } void StringUtf8ExtraBytes::sequential_mutation(std::shared_ptr<StringBase> obj) { random_mutation(obj); } bool StringUtf8ExtraBytes::supported(std::shared_ptr<StringBase> obj) { if (!obj) return false; auto ptr = std::dynamic_pointer_cast<String>(obj); if (!ptr) return false; if (obj->type == "ascii" || obj->type.find("utf-8") == 0 || obj->type.find("utf8") == 0) { return true; } return false; } std::int64_t StringUtf8ExtraBytes::get_count() { return this->total; }
07-09
你提供的 C++ 代码中存在一些关键问题，特别是： - `obj->value` 是 `std::vector<uint32_t>` 类型，但你在构造 `std::string input(...)` 时却用它来初始化； - `encode_string()` 的参数是 `std::string& input`...
StringUtf8ExtraBytes::StringUtf8ExtraBytes(std::shared_ptr<StringBase> obj, std::mt19937 &rand) : total(obj->value.length()), encoding(obj->type) {} std::vector<uint8_t> StringUtf8ExtraBytes::encode_string(std::string& input, std::vector<int>& indices, int engine) { std::default_random_engine rand_engine(engine); std::vector<uint8_t> result; for (size_t i = 0; i < input.size(); ++i) { char32_t ch = input[i]; uint32_t code_point = static_cast<uint8_t>(ch); int byte_count = ENCODE::get_byte_count(code_point); int mutated_count = byte_count; std::vector<uint8_t > encoded; bool selected_mutate = false; for (int idx : indices) { if (static_cast<size_t>(idx) == i + 1) { selected_mutate = true; break; } } if (selected_mutate) { std::uniform_int_distribution<int> mutation_dist(byte_count + 1, 6); mutated_count = mutation_dist(rand_engine); } switch (mutated_count) { case 1: encoded.push_back(static_cast<uint8_t>(code_point)); break; case 2: encoded.push_back(0xC0 | ((code_point >> 6) & 0x1F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; case 3: encoded.push_back(0xE0 | ((code_point >> 12) & 0x0F)); encoded.push_back(0x80 | ((code_point >> 6) & 0x3F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; case 4: encoded.push_back(0xF0 | ((code_point >> 18) & 0x07)); encoded.push_back(0x80 | ((code_point >> 12) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 6) & 0x3F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; case 5: encoded.push_back(0xF8 | ((code_point >> 24) & 0x03)); encoded.push_back(0x80 | ((code_point >> 18) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 12) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 6) & 0x3F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; case 6: encoded.push_back(0xFC | ((code_point >> 30) & 0x01)); encoded.push_back(0x80 | ((code_point >> 24) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 18) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 12) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 6) & 0x3F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; default: throw std::runtime_error("Unsupported value"); } result.insert(result.end(), encoded.begin(), encoded.end()); } return result; } void StringUtf8ExtraBytes::random_mutation(std::shared_ptr<StringBase> obj) { std::random_device rd; std::mt19937 engine(rd()); std::string input(obj->value.data(), obj->value.size()); int num = pick_six(rand); int length = static_cast<int>(input.length()); int sample_count = std::min(num, length); std::vector<int> indices_all(length); std::iota(indices_all.begin(), indices_all.end(), 1); std::vector<int> indices(sample_count); std::sample(indices_all.begin(), indices_all.end(), std::back_inserter(indices), sample_count, rand); auto encoded_bytes = encode_string(input, indices, engine()); std::string str_mutated(encoded_bytes.begin(), encoded_bytes.end()); obj->mutated_value = str_mutated; obj->mutated = true; } void StringUtf8ExtraBytes::sequential_mutation(std::shared_ptr<StringBase> obj) { random_mutation(obj); } bool StringUtf8ExtraBytes::supported(std::shared_ptr<StringBase> obj) { if (!obj) return false; auto ptr = std::dynamic_pointer_cast<String>(obj); if (!ptr) return false; if (obj->type == "ascii" || obj->type.find("utf-8") == 0 || obj->type.find("utf8") == 0) { return true; } return false; } std::int64_t StringUtf8ExtraBytes::get_count() { return this->total; }和上面思路一样的，这段代码中obj->mutated_value和obj->value都是std::vectorstd::uint32_t类型了，请你修改代码
07-09
encoded.push_back(0xE0 | ((code_point >> 12) & 0x0F)); encoded.push_back(0x80 | ((code_point >> 6) & 0x3F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; case 4: encoded.push_back(0xF0 ...
比较下面cpp代码和python代码的功能区别,找出cpp代码有没有什么错误 StringUtf8ExtraBytes::StringUtf8ExtraBytes(std::shared_ptr<StringBase> obj, std::mt19937 &rand) : total(obj->value.size()), encoding(obj->type) {} std::vector<uint8_t> StringUtf8ExtraBytes::cp2bytes(std::vector<uint32_t> input, std::vector<int> &indices, int engine) { std::default_random_engine rand_engine(engine); std::vector<uint8_t> result; for (size_t i = 0; i < input.size(); ++i) { uint32_t code_point = input[i]; int byte_count = ENCODE::get_byte_count(code_point); int mutated_count = byte_count; std::vector<uint8_t> encoded; bool selected_mutate = false; for (int idx: indices) { if (idx == static_cast<int>(i + 1)) { selected_mutate = true; break; } } if (selected_mutate) { std::uniform_int_distribution<int> mutation_dist(byte_count + 1, 6); mutated_count = mutation_dist(rand_engine); } switch (mutated_count) { case 1: encoded.push_back(static_cast<uint8_t>(code_point)); break; case 2: encoded.push_back(0xC0 | ((code_point >> 6) & 0x1F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; case 3: encoded.push_back(0xE0 | ((code_point >> 12) & 0x0F)); encoded.push_back(0x80 | ((code_point >> 6) & 0x3F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; case 4: encoded.push_back(0xF0 | ((code_point >> 18) & 0x07)); encoded.push_back(0x80 | ((code_point >> 12) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 6) & 0x3F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; case 5: encoded.push_back(0xF8 | ((code_point >> 24) & 0x03)); encoded.push_back(0x80 | ((code_point >> 18) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 12) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 6) & 0x3F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; case 6: encoded.push_back(0xFC | ((code_point >> 30) & 0x01)); encoded.push_back(0x80 | ((code_point >> 24) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 18) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 12) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 6) & 0x3F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; default: throw std::runtime_error("Unsupported value"); } } return result; } std::vector<uint32_t> StringUtf8ExtraBytes::bytes2cp(const std::vector<uint8_t> &bytes) { std::vector<uint32_t> code_points; size_t i = 0; while (i < bytes.size()) { uint8_t byte = bytes[i]; if ((byte & 0x80) == 0x00) { // 1byte code_points.push_back(byte); ++i; } else if ((byte & 0xE0) == 0xC0) { // 2bytes code_points.push_back(((byte & 0x1F) << 6) | (bytes[i + 1] & 0x3F)); i += 2; } else if ((byte & 0xF0) == 0xE0) { // 3bytes code_points.push_back(((byte & 0x0F) << 12) | ((bytes[i + 1] & 0x3F) << 6) | (bytes[i + 2] & 0x3F)); i += 3; } else if ((byte & 0xF8) == 0xF0) { // 4bytes code_points.push_back(((byte & 0x07) << 18) | ((bytes[i + 1] & 0x3F) << 12) | ((bytes[i + 2] & 0x3F) << 6) | (bytes[i + 3] & 0x3F)); i += 4; } else { throw std::runtime_error("Invalid UTF-8"); } } return code_points; } void StringUtf8ExtraBytes::random_mutation(std::shared_ptr<StringBase> obj) { std::random_device rd; std::mt19937 engine(rd()); std::vector<uint32_t> input(obj->value.begin(), obj->value.end()); int num = pick_six(rand); int length = static_cast<int>(input.size()); int sample_count = std::min(num, length); std::vector<int> indices_all(length); std::iota(indices_all.begin(), indices_all.end(), 1); std::vector<int> indices(sample_count); std::sample(indices_all.begin(), indices_all.end(), std::back_inserter(indices), sample_count, rand); auto encoded_bytes = cp2bytes(input, indices, engine()); auto decoded_cp = bytes2cp(encoded_bytes); std::vector<uint32_t> str_mutated(decoded_cp.begin(), decoded_cp.end()); obj->mutated_value = str_mutated; obj->mutated = true; } void StringUtf8ExtraBytes::sequential_mutation(std::shared_ptr<StringBase> obj) { random_mutation(obj); } bool StringUtf8ExtraBytes::supported(std::shared_ptr<StringBase> obj) { if (!obj) return false; auto ptr = std::dynamic_pointer_cast<String>(obj); if (!ptr) return false; if (obj->type == "ascii" || obj->type.find("utf-8") == 0 || obj->type.find("utf8") == 0) { return true; } return false; } std::int64_t StringUtf8ExtraBytes::get_count() { return this->total; } class StringUtf8ExtraBytes(Mutator): mutated_elements = [] def __init__(self, obj, rand): Mutator.__init__(self) self.rand = rand self.encoding = obj.type unicode_str = obj.value.decode(self.encoding) self.total = len(unicode_str) @classmethod def get_byte_count(cls, ch): num = 0 if ch <= 0x7F: num = 1 elif ch <= 0x7FF: num = 2 elif ch <= 0xFFFF: num = 3 elif ch <= 0x1FFFFF: num = 4 elif ch <= 0x3FFFFFF: num = 5 elif ch <= 0x7FFFFFFF: num = 6 return num @classmethod def encode_string(cls, string, indices, rand): res = BytesIO() for ind, ch in enumerate(string): # Get the code point of the unicode character code_point = ord(ch) # How many bytes needed for the character to be encoded in utf-8 byte_count = cls.get_byte_count(code_point) mutated_count = byte_count char_encoded_array = [] # Randomly choose bytes count the encoded character to be expanded to. if ind + 1 in indices: mutated_count = rand.randint(byte_count + 1, 6) if mutated_count == 1: char_encoded_array.append(code_point) elif mutated_count == 2: char_encoded_array.append(0xC0 | (code_point >> 6)) char_encoded_array.append(0x80 | (code_point >> 0x3F)) elif mutated_count == 3: char_encoded_array.append(0xE0 | (code_point >> 12)) char_encoded_array.append(0x80 | ((code_point >> 6) & 0x3F)) char_encoded_array.append(0x80 | (code_point & 0x3F)) elif mutated_count == 4: char_encoded_array.append(0xF0 | (code_point >> 18)) char_encoded_array.append(0x80 | ((code_point >> 12) & 0x3F)) char_encoded_array.append(0x80 | ((code_point >> 6) & 0x3F)) char_encoded_array.append(0x80 | (code_point & 0x3F)) elif mutated_count == 5: char_encoded_array.append(0xF8 | (code_point >> 24)) char_encoded_array.append(0x80 | ((code_point >> 18) & 0x3F)) char_encoded_array.append(0x80 | ((code_point >> 12) & 0x3F)) char_encoded_array.append(0x80 | ((code_point >> 6) & 0x3F)) char_encoded_array.append(0x80 | (code_point & 0x3F)) elif mutated_count == 6: char_encoded_array.append(0xFC | (code_point >> 30)) char_encoded_array.append(0x80 | ((code_point >> 24) & 0x3F)) char_encoded_array.append(0x80 | ((code_point >> 18) & 0x3F)) char_encoded_array.append(0x80 | ((code_point >> 12) & 0x3F)) char_encoded_array.append(0x80 | ((code_point >> 6) & 0x3F)) char_encoded_array.append(0x80 | (code_point & 0x3F)) else: raise ValueError("Unsupported value") res.write(bytes(char_encoded_array)) res.seek(0) return res.read() def random_mutation(self, obj): string = bytearray(obj.value) # Parse byte string to unicode string. unicode_str = string.decode(self.encoding) # Pick number from 1-6 (stddev = 5/3) num = pick_six(self.rand) indices = self.rand.sample(range(1, len(unicode_str) + 1), min(num, len(unicode_str))) str_mutated = self.encode_string(unicode_str, indices, self.rand) obj.mutated_value = str_mutated obj.mutated = True def sequential_mutation(self, obj): self.random_mutation(obj) @classmethod def supported(cls, obj): if isinstance(obj, String) and (obj.type == "ascii" or obj.type.startswith("uft8")): return True return False def get_count(self): return self.total
最新发布
07-10
encoded.push_back(0x80 | ((code_point >> 12) & 0x3F)); encoded.push_back(0x80 | ((code_point >> 6) & 0x3F)); encoded.push_back(0x80 | (code_point & 0x3F)); break; case 5: encoded.push_back(0xF8 ...
请注意，在接下来C++编码过程中，不要在意内存占用，速度优先！不要在意内存占用，速度优先！ 你需要实现一个数据结构，可以快速拼接复制以及读取，且绝对不会遇到修改/删除中间某个数据的情况。(类似于Scratch变量的效果) 请使得重复拼接10000000次单个int(也就是最后长度为10000001)达到0.5秒以内，随机读取这个数据10000000次达到0.1秒以内。 可以参考数据结构树，这可能有助于快速复制与拼接，但深度不能太深，预计10-20层可以达到目标 只要能提升速度的话，你可以使用任何头文件，包括第三方头文件。 以下是要实现的函数: 0.My_Str(My_Str& a) 1.get_length() 2.int operator[](size_t l) 3.void push_front(My_Str& a) 4.void push_back(My_Str& a) 5.void push_front(int* a) 6.void push_back(int* a) 7.My_Stroperator+(const My_Str& In)
06-23
我们面临的问题是需要一个高效的数据结构来支持快速的拼接（push_front和push_back）和随机读取（operator[]），并且要支持高效的复制构造（My_Str(My_Str&a)）。要求重复拼接10000000次单个int（即10000001个元素）...
记录不熟悉的函数用法（C++）——insert
weixin_43836257的博客
04-27 3139
详细解读C++中insert函数的作用
C++中Insert函数的应用
2301_79087383的博客
10-18 1万+
下面我们来理解一下这个循环，第一次调用insert函数之后insert函数返回的迭代器指向我们读入的str这个新元素，我们将此迭代器赋予it并不断循环，只要不断有str读入，it就会不断更新并指向新元素，所以就可以不断在将新元素插入到list首元素之前的位置。vector不支持push_back，但我们可以通过insert函数将元素插入到begin（）之前，且注意插入到vector末尾之外任何位置都可能很慢。将元素插入到vector、deque和string的任何位置都是合法的，然而，这样可能很耗时。
c语言insert作用,C++string中的insert()插入函数详解
weixin_32558567的博客
05-16 7609
下面通过代码给大家介绍c++ string insert() 函数，具体内容如下：basic_string& insert (size_type pos, const basic_string& str);在原串下标为pos的字符前插入字符串strbasic_string& insert (size_type pos, const basic_string& st...
C++容器的insert()函数有以下三种用法: 最终*it=val;
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06-29 3万+
C++容器的insert()函数有以下三种用法: 最终*it=val; //用法1:在指定位置it前“插入”值为val的元素,返回指向这个元素的迭代器, iterator insert( iterator it, const TYPE &val );  //用法2:在指定位置it前“插入”num个值为val的元素  void insert( iterator it, size_ty
C++ 顺序容器的操作（2）push_back、push_front、insert
梦幻DUO的游戏开发之路
02-15 1万+
1、在顺序容器中添加元素 c.push_back(t) c.push_front(t) c.insert(p,t)//在p迭代器位置插入t c.insert(p,n,t)//在p迭代器位置插入n个t c.insert(p,b,e)//在p迭代器位置插入b迭代器和e迭代器直接的元素 vector只能往后插，list和deque可以往前插 2、容器元素都是副本，不会修改传进去的变量的值
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