Returns the maximum number of elements the container is able to hold due to system or library implementation limitations, i.e.std::distance(begin(), end()) for the largest container.

[edit]Return value

Maximum number of elements.

[edit]Complexity

Constant.

[edit]Notes

This value typically reflects the theoretical limit on the size of the container, at moststd::numeric_limits<difference_type>::max(). At runtime, the size of the container may be limited to a value smaller thanmax_size() by the amount of RAM available.

[edit]Example

#include <iostream>#include <locale>#include <vector> int main(){std::vector<char> p;std::vector<long> q; std::cout.imbue(std::locale("en_US.UTF-8"));std::cout<<std::uppercase<<"p.max_size() = "<<std::dec<< p.max_size()<<" = 0x"<<std::hex<< p.max_size()<<'\n'<<"q.max_size() = "<<std::dec<< q.max_size()<<" = 0x"<<std::hex<< q.max_size()<<'\n';}

p.max_size() = 9,223,372,036,854,775,807 = 0x7,FFF,FFF,FFF,FFF,FFFq.max_size() = 1,152,921,504,606,846,975 = 0xFFF,FFF,FFF,FFF,FFF

See also

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