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Added example of static inline member variables to #inline varibles (#77)

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* Added example of static inline member variables to #inline varibles
This commit is contained in:
Frede
2020-01-26 20:00:18 +01:00
committed by Anthony Calandra
parent 1c53669d1f
commit 31cc7ac850
2 changed files with 23 additions and 3 deletions
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CPP17.md
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@@ -150,6 +150,16 @@ S x2 = S{123}; // mov eax, dword ptr [.L_ZZ4mainE2x2]
// .L_ZZ4mainE2x2: .long 123
```
It can also be used to declare and define a static member variable, such that it does not need to be initialized in the source file.
```c++
struct S {
S() : id(count++) {}
~S() {count--;}
int id;
static inline int count{0}; // declare and initialize count to 0 within the class
};
```
### Nested namespaces
Using the namespace resolution operator to create nested namespace definitions.
```c++
@@ -393,7 +403,7 @@ The new `std::filesystem` library provides a standard way to manipulate files, d
Here, a big file is copied to a temporary path if there is available space:
```c++
const auto bigFilePath {"bigFileToCopy"};
if (std::filesystem::exists(bigFilePath)) {
if (std::filesystem::exists(bigFilePath)) {
const auto bigFileSize {std::filesystem::file_size(bigFilePath)};
std::filesystem::path tmpPath {"/tmp"};
if (std::filesystem::space(tmpPath).available > bigFileSize) {