Difference between revisions of "cpp/container/span/size bytes"
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{{cpp/container/span/title|size_bytes}} | {{cpp/container/span/title|size_bytes}} | ||
{{cpp/container/span/navbar}} | {{cpp/container/span/navbar}} | ||
| − | {{ddcl|1= | + | {{ddcl|since=c++20|1= |
constexpr size_type size_bytes() const noexcept; | constexpr size_type size_bytes() const noexcept; | ||
}} | }} | ||
| Line 7: | Line 7: | ||
Returns the size of the sequence in bytes. | Returns the size of the sequence in bytes. | ||
| − | === Return value === | + | ===Parameters=== |
| + | (none) | ||
| + | |||
| + | ===Return value=== | ||
The size of the sequence in bytes, i.e., {{c|size() * sizeof(element_type)}}. | The size of the sequence in bytes, i.e., {{c|size() * sizeof(element_type)}}. | ||
| − | === Example === | + | ===Example=== |
| − | {{example|code= | + | {{example |
| − | + | |code= | |
#include <cstdint> | #include <cstdint> | ||
| + | #include <span> | ||
int main() | int main() | ||
{ | { | ||
| − | + | constexpr static std::int32_t a[]{1, 2, 3, 4, 5}; | |
| − | constexpr std::span s{a}; | + | constexpr static std::span s{a}; |
| − | + | ||
| − | static_assert( sizeof(int32_t) == 4 | + | static_assert |
| − | + | ( | |
| − | + | sizeof(int32_t) == 4 && | |
| − | + | std::size(a) == 5 && | |
| − | + | sizeof a == 20 && | |
| + | s.size() == 5 && | ||
| + | s.size_bytes() == 20 | ||
| + | ); | ||
} | } | ||
}} | }} | ||
| − | === See also === | + | ===See also=== |
{{dsc begin}} | {{dsc begin}} | ||
| − | {{dsc inc | cpp/container/span/dsc size}} | + | {{dsc inc|cpp/container/span/dsc size}} |
{{dsc end}} | {{dsc end}} | ||
| − | {{langlinks|ja|zh}} | + | {{langlinks|de|es|ja|ru|zh}} |
Latest revision as of 07:32, 5 November 2023
| constexpr size_type size_bytes() const noexcept; |
(since C++20) | |
Returns the size of the sequence in bytes.
Contents |
[edit] Parameters
(none)
[edit] Return value
The size of the sequence in bytes, i.e., size() * sizeof(element_type).
[edit] Example
Run this code
#include <cstdint> #include <span> int main() { constexpr static std::int32_t a[]{1, 2, 3, 4, 5}; constexpr static std::span s{a}; static_assert ( sizeof(int32_t) == 4 && std::size(a) == 5 && sizeof a == 20 && s.size() == 5 && s.size_bytes() == 20 ); }
[edit] See also
| (C++20) |
returns the number of elements in the sequence (public member function) |
