[英]erasing entry from boost vector
First off, I'm relatively new to boost. 首先,我是新手。 I have a vector of type:
boost::container::vector<std::string> plates
and i iterate through it with 我有一个向量类型:
boost::container::vector<std::string> plates
,我用它遍历它
for ( unsigned int k = 0; k < plates.size(); k++ )
, so far so good. for ( unsigned int k = 0; k < plates.size(); k++ )
,到目前为止for ( unsigned int k = 0; k < plates.size(); k++ )
顺利。
Now, I need to erase elements from within the loop and I attempted the following: plates.erase(plates.begin()+k);
现在,我需要从循环中擦除元素,然后尝试执行以下操作:
plates.erase(plates.begin()+k);
but that gives me the below output and terminates my application: 但这给了我下面的输出并终止了我的应用程序:
include/boost/container/vector.hpp:1595: boost::container::vector<T, Allocator, Options>::reference boost::container::vector<T,
, Options>::size_type) [with T = std::__cxx11::basic_string<char>; Allocator = boost::container::new_allocator<std::__cxx11::basic_string<char> >; Options = void; boost
:basic_string<char>&; boost::container::vector<T, Allocator, Options>::size_type = long unsigned int]: Assertion `this->m_holder.m_size > n' failed.
What am I doing wrong here? 我在这里做错了什么? My loop looks something like this where
foo()
returns a pointer or NULL: 我的循环看起来像这样,其中
foo()
返回一个指针或NULL:
for ( unsigned int k = 0; k < plates.size(); k++ ) {
if (foo(&lpmap, plates[k]) != NULL){
std::cout << "DEBUG: erase" << std::endl;
plates.erase(plates.begin()+k);
} else {
std::cout << "print " << plates[k] << std::endl;
}
}
EDIT 1 编辑1
for ( unsigned int k = 0; k < plates.size();) {
if (foo(&lpmap, plates[k]) != NULL){
std::cout << "DEBUG: erase" << std::endl;
plates.erase(plates.begin()+k);
} else {
std::cout << "print " << plates[k] << std::endl;
k++;
}
}
There is an assertion in boost that checks if you try to access an index out of range. boost中有一个断言,用于检查您是否尝试访问超出范围的索引。 so if you used
plates[k]
with k more than actual size, you get an assertion. 因此,如果您使用的
plates[k]
的k大于实际大小,则会得到一个断言。
You can see the check right in the boost code: https://www.boost.org/doc/libs/master/boost/container/vector.hpp . 您可以在增强代码中看到该检查: https : //www.boost.org/doc/libs/master/boost/container/vector.hpp 。
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