From 9e4c8cce85d27211fb07898d4077de4b5dc5c003 Mon Sep 17 00:00:00 2001
From: Sebastien Gilles <sebastien.gilles@inria.fr>
Date: Mon, 20 May 2019 09:45:48 +0200
Subject: [PATCH] Add explanation about c_str(); also commit without cells
executed for the notebook.
---
1-ProceduralProgramming/3-Types.ipynb | 190 ++++++++------------------
1 file changed, 57 insertions(+), 133 deletions(-)
diff --git a/1-ProceduralProgramming/3-Types.ipynb b/1-ProceduralProgramming/3-Types.ipynb
index cf85b4b..1d5a2f1 100644
--- a/1-ProceduralProgramming/3-Types.ipynb
+++ b/1-ProceduralProgramming/3-Types.ipynb
@@ -541,26 +541,14 @@
"\n",
"In modern C++, rather than bothering with character tables\n",
"which come from the C language, it's easier to use the type `std::string`, provided\n",
- "through the standard language library:"
+ "through the standard language library, that provides a much simpler syntax:"
]
},
{
"cell_type": "code",
- "execution_count": 1,
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "text": [
- "String 'bonjour' is 7 characters long.\n",
- "String 'coucou' is 6 characters long.\n",
- "String 'bonjour' is 7 characters long.\n",
- "String 'dynamic std::string' is 19 characters long.\n",
- "String 'std::string is dynamical and flexible' is 37 characters long.\n"
- ]
- }
- ],
+ "execution_count": null,
+ "metadata": {},
+ "outputs": [],
"source": [
"#include <iostream>\n",
"#include <cstring> // For strlen\n",
@@ -590,6 +578,35 @@
"}"
]
},
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "If needed (for instance to interact with a C library) you may access to the underlying table with `c_str()`:"
+ ]
+ },
+ {
+ "cell_type": "code",
+ "execution_count": null,
+ "metadata": {},
+ "outputs": [],
+ "source": [
+ "#include <string>\n",
+ "\n",
+ "{\n",
+ " std::string cplusplus_string(\"C++ string!\");\n",
+ " \n",
+ " const char* c_string = cplusplus_string.c_str(); // notice the `const`\n",
+ "}"
+ ]
+ },
+ {
+ "cell_type": "markdown",
+ "metadata": {},
+ "source": [
+ "The `const` here is important: you may access the content but should not modify it; this functionality is provided for read-only access."
+ ]
+ },
{
"cell_type": "markdown",
"metadata": {},
@@ -608,17 +625,9 @@
},
{
"cell_type": "code",
- "execution_count": 2,
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "text": [
- "Area = 3.14159265358979\n"
- ]
- }
- ],
+ "execution_count": null,
+ "metadata": {},
+ "outputs": [],
"source": [
"#include <iostream>\n",
"#include <iomanip> // For std::setprecision\n",
@@ -641,17 +650,9 @@
},
{
"cell_type": "code",
- "execution_count": 3,
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "text": [
- "Area = 3.14159274101257\n"
- ]
- }
- ],
+ "execution_count": null,
+ "metadata": {},
+ "outputs": [],
"source": [
"#include <iostream>\n",
"#include <iomanip> // For std::setprecision\n",
@@ -680,7 +681,7 @@
},
{
"cell_type": "code",
- "execution_count": 4,
+ "execution_count": null,
"metadata": {},
"outputs": [],
"source": [
@@ -703,24 +704,9 @@
},
{
"cell_type": "code",
- "execution_count": 5,
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "text": [
- "2 is prime.\n",
- "3 is prime.\n",
- "5 is prime.\n",
- "7 is prime.\n",
- "11 is prime.\n",
- "13 is prime.\n",
- "17 is prime.\n",
- "19 is prime.\n"
- ]
- }
- ],
+ "execution_count": null,
+ "metadata": {},
+ "outputs": [],
"source": [
"#include <vector>\n",
"#include <iostream>\n",
@@ -747,26 +733,11 @@
},
{
"cell_type": "code",
- "execution_count": 6,
+ "execution_count": null,
"metadata": {
"scrolled": true
},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "text": [
- "2 is prime.\n",
- "3 is prime.\n",
- "5 is prime.\n",
- "7 is prime.\n",
- "11 is prime.\n",
- "13 is prime.\n",
- "17 is prime.\n",
- "19 is prime.\n"
- ]
- }
- ],
+ "outputs": [],
"source": [
"#include <vector>\n",
"#include <iostream>\n",
@@ -793,24 +764,9 @@
},
{
"cell_type": "code",
- "execution_count": 7,
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "text": [
- "2 is prime.\n",
- "3 is prime.\n",
- "5 is prime.\n",
- "7 is prime.\n",
- "11 is prime.\n",
- "13 is prime.\n",
- "17 is prime.\n",
- "19 is prime.\n"
- ]
- }
- ],
+ "execution_count": null,
+ "metadata": {},
+ "outputs": [],
"source": [
"#include <vector>\n",
"#include <iostream>\n",
@@ -836,24 +792,9 @@
},
{
"cell_type": "code",
- "execution_count": 8,
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "text": [
- "2 is prime.\n",
- "3 is prime.\n",
- "5 is prime.\n",
- "7 is prime.\n",
- "11 is prime.\n",
- "13 is prime.\n",
- "17 is prime.\n",
- "19 is prime.\n"
- ]
- }
- ],
+ "execution_count": null,
+ "metadata": {},
+ "outputs": [],
"source": [
"#include <vector>\n",
"#include <iostream>\n",
@@ -881,18 +822,9 @@
},
{
"cell_type": "code",
- "execution_count": 9,
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "text": [
- "j and k are of different type.\n",
- "i and k are of the same type.\n"
- ]
- }
- ],
+ "execution_count": null,
+ "metadata": {},
+ "outputs": [],
"source": [
"#include <algorithm>\n",
"#include <iostream>\n",
@@ -928,17 +860,9 @@
},
{
"cell_type": "code",
- "execution_count": 10,
- "metadata": {},
- "outputs": [
- {
- "name": "stdout",
- "output_type": "stream",
- "text": [
- "j and k are of the same type.\n"
- ]
- }
- ],
+ "execution_count": null,
+ "metadata": {},
+ "outputs": [],
"source": [
"#include <algorithm>\n",
"#include <iostream>\n",
--
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